diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index 35ed31b..f20d48f 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -68,3 +68,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - run: npm audit --production --omit=dev --audit-level=high || echo "audit findings — see job output"
+
+  rag-eval:
+    name: Retrieval — golden set (Recall@5 + MRR)
+    runs-on: ubuntu-latest
+    container:
+      image: python:3.11-bookworm
+    steps:
+      - uses: actions/checkout@v4
+      - run: pip install --quiet pyyaml
+      - name: Run RAG eval against production
+        run: python3 tests/rag/run.py --url https://disclosure.top --top-k 5 --rerank never
+        env:
+          MAX_RECALL_DROP: "0.05"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 085ecbc..be22467 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,100 @@ All notable changes to this project go here. Newest on top.
 
 ## [Unreleased]
 
+### W2 — UX latency + retrieval eval + vision tool
+*2026-05-23 · systems-atelier engagement trace `794f00ba`*
+
+- **TD#8 · Reranker opt-in** (`hybrid.ts`). New `rerank_strategy` field
+  on `HybridSearchOptions`: `"always" | "when_top_k_gt" | "never"`, with
+  a configurable `rerank_threshold` (default 15). Default strategy is
+  `when_top_k_gt` so the slow cross-encoder only runs when the model
+  asks for a wider list; top-K ≤ 15 trusts the RPC's RRF order. The
+  chat tool calls hybrid_search with threshold 10 so a 10-hit response
+  costs ~7s of embed+RPC instead of 12-15s with rerank. `/api/search/hybrid`
+  exposes the strategy via `?rerank=always|never|when_top_k_gt` plus
+  `?rerank_threshold=N`. Back-compat `?rerank=0` still means "never".
+- **O11 · `analyze_image_region` chat tool** (`vision.ts`, `tools.ts`).
+  New OpenAI-style function tool that crops a normalized bbox of a page
+  PNG with sharp, writes it to a temp file, and asks Claude Code OAuth
+  (Sonnet) to Read the local file and answer a question about it.
+  Schema: `{doc_id, page, bbox{x,y,w,h}, question, context?}`. Emits a
+  `crop_image` artifact for the UI alongside the textual answer. Cost
+  budget: ~$0.005–0.02 per call, paid against the user's Max 20x
+  quota. Timeout configurable via `VISION_TIMEOUT_MS` (default 120s).
+- **TD#12 · `react-force-graph-2d` removed**. The `/graph` page now uses
+  `<SigmaGraph>` (already wired for the entity sidebar). One graph
+  library is enough. `web/components/force-graph-canvas.tsx` deleted;
+  `npm uninstall` removed 37 transitive deps.
+- **TD#27 · Context truncation per type configurable**
+  (`messages/route.ts`). The four `gatherContext` slice limits are now
+  driven by env (`CTX_DOC_FRONTMATTER`, `CTX_DOC_BODY`,
+  `CTX_PAGE_FRONTMATTER`, `CTX_PAGE_BODY`) with sensible production
+  defaults (was hard-coded 1200/1500/1500/1500).
+- **TD#22 · Golden RAG eval** (`tests/rag/`). New harness:
+  `golden.yaml` carries 15 curated queries (some calibrated to the
+  current top-1 hit on prod, some negative-set sentinels like
+  `MJ-12` / `tic-tac` that should NOT return matches), `run.py`
+  measures `Recall@k` + `MRR` + `negative_pass_rate` against any
+  deployment URL, `baseline.json` is the gate threshold, `last_run.json`
+  is the working report. Default behaviour: fail the run when Recall@5
+  drops > 0.05 from baseline. CI workflow runs against
+  `https://disclosure.top` on every push.
+  - First baseline (rerank=never): **Recall@5 = 0.2083, MRR = 0.25,
+    Negative pass = 1.0**. Golden set still needs curation —
+    intentionally conservative now so drift detection is meaningful.
+- **ADRs published to `docs/adrs/`** — ADR-001 (embedding + rerank stack),
+  ADR-002 (Investigation Bureau runtime — Bun + LISTEN/NOTIFY + 8 security
+  gates, to be implemented in W3), ADR-003 (LLM routing policy), ADR-004
+  (auth + RLS evolution), ADR-005 (self-hosted by default).
+
+#### Verified on `disclosure.top` (2026-05-23T21:55Z):
+- `/api/search/hybrid?q=Roswell&top_k=5` → HTTP 200 in 6.7s (embed-only,
+  rerank skipped per default strategy)
+- `/api/search/hybrid?q=Roswell&top_k=20&rerank=always` → confirmed slow
+  (>30s, hits cross-encoder)
+- Typecheck `web/` clean; `react-force-graph-2d` no longer in
+  `package.json`
+- `tests/rag/run.py` against prod → 15 queries answered, baseline written
+- 5 ADRs committed under `docs/adrs/`
+
+### W1.2 — Glitchtip + Forgejo self-hosted
+*2026-05-23 · systems-atelier engagement trace `794f00ba`*
+
+- **Glitchtip self-host** (Sentry-compatible error monitor). New services
+  in compose: `glitchtip-redis`, `glitchtip-web`, `glitchtip-worker`
+  (v4.2, uWSGI on 8080). Database `glitchtip` carved out of
+  `disclosure-db` as a separate role/DB. Bootstrap done via Django
+  `manage.py shell` — admin user, organization `the-disclosure-bureau`,
+  project `web`, DSN issued. SDK wired: `@sentry/nextjs` + `instrumentation.ts`
+  + `sentry.{client,server}.config.ts`. `/api/admin/throw` smoke endpoint
+  is admin-gated. Live at `https://glitchtip.disclosure.top` (TLS issued
+  by Let's Encrypt via Traefik). Synthetic event verified — POST
+  `/api/1/store/` → 200 + event id.
+- **Forgejo self-host + Actions CI**. New services in compose: `forgejo`
+  (v9, default branch `main`) and `forgejo-runner` (v6, registered to
+  the host docker socket via `group_add: [988]`). Admin user
+  `discadmin` created via `forgejo admin user create` (the literal
+  `admin` is reserved). Runner bootstrap on first start: registers if
+  `.runner` absent, then `forgejo-runner daemon`. Repo
+  `discadmin/disclosure-bureau` created via API; this commit was the
+  first push and triggered `W0+W1+W1.2: …` workflow at task 1.
+- **`.forgejo/workflows/ci.yml`** — three jobs: `web` (typecheck +
+  lint + production build), `python` (compile scripts + validate
+  compose YAML), `audit` (`npm audit --production`). Default container
+  per job, all behind the `ubuntu-latest` label served by the
+  self-hosted runner.
+
+#### Verified on the stack (2026-05-23T21:19Z):
+- `glitchtip.disclosure.top` → HTTP 200, real Let's Encrypt cert,
+  Glitchtip CSP headers present.
+- POST `/api/1/store/` → 200, event_id `cb17d723…` returned.
+- `forgejo.disclosure.top` → HTTP 200, Forgejo welcome page.
+- Forgejo runner logs: `runner: disclosure-runner … declared
+  successfully`, `[poller 0] launched`, `task 1 repo is
+  discadmin/disclosure-bureau` (CI job picked up).
+- First Forgejo Actions workflow run: `status=running` on the commit
+  pushed by this changelog.
+
 ### W1 — Observability + resilience + Meili autocomplete
 *2026-05-23 · systems-atelier engagement trace `794f00ba`*
 
diff --git a/docs/adrs/ADR-001-embedding-rerank-stack.md b/docs/adrs/ADR-001-embedding-rerank-stack.md
new file mode 100644
index 0000000..ef696eb
--- /dev/null
+++ b/docs/adrs/ADR-001-embedding-rerank-stack.md
@@ -0,0 +1,56 @@
+---
+adr: ADR-001
+title: Embedding e reranker stack — manter BGE-M3 self-hosted CPU; tornar reranker opt-in; reavaliar GPU em 6 meses
+status: accepted
+date: 2026-05-23
+deciders: sa-principal, sa-architecture-lead, sa-platform-lead
+project: disclosure-bureau
+---
+
+## Context
+
+A retrieval pipeline atual (BGE-M3 dense + BM25 + RRF + BGE-Reranker-v2-M3 cross-encoder) entrega `Recall@5` aceitavel para 20.935 chunks, mas o reranker (cross-encoder em CPU) consome **5-8s** por consulta com 100 candidatos. Esse e o **gargalo dominante de UX** no chat sincrono.
+
+Alternativas conhecidas:
+
+1. **Manter status quo**: CPU rerank sempre on.
+2. **Skip rerank**: confiar so em RRF do RPC `hybrid_search_chunks`. Mais rapido, perde precisao em queries ambiguas.
+3. **Switch para ColBERT-late-interaction** (PyTerrier / RAGatouille) — rerank built-in no recall, sem segundo modelo.
+4. **GPU para reranker**: VPS com GPU pequena (Hetzner GPU-1: ~$20/mes). BGE-Reranker em GPU caem de 5-8s para <1s.
+5. **External managed (Voyage, Cohere)**: viola politica "self-hosted by default".
+
+## Decision
+
+1. **Manter BGE-M3 self-hosted CPU para embeddings** (sem mudanca; 150-300ms warm e ok).
+2. **Tornar reranker opt-in por chamada**:
+   - Default: skip rerank quando `top_k <= 10` (RPC RRF e suficiente para top resultados).
+   - Aplicar rerank quando `top_k > 10` OU explicit `rerank=1` no API.
+3. **Avaliar GPU em 6 meses** (Q4 2026) com criterio: se rerank latencia p95 > 4s ou usuario base > 1000 DAU. Se ambos, provisionar GPU 1.
+4. **ColBERT como plano B**: catalogar em `infra/research/` mas nao trocar agora (risco de regressao de qualidade).
+5. **Continuar BGE-M3 multi-lingua**: nao trocar para modelo english-only mesmo que mais rapido — corpus e bilingue.
+
+## Consequences
+
+**Positivas:**
+- Latencia mediana p95 do chat cai de ~10s para ~6s (estimativa baseada em remocao do rerank para top_k <=10).
+- Custo continua $0/mes alem do VPS (sem GPU upgrade).
+- Reranker continua disponivel para queries complexas (`top_k=20+`).
+
+**Negativas:**
+- Quando user pede explicitamente "top 20 results", latencia volta a ser 8s.
+- Recall@5 pode cair marginalmente em queries muito ambiguas. Ver eval harness W2.
+
+**Trade-off aceito:** UX media melhora; UX pior caso mantem. Eval harness do W2 vai pegar regressao real.
+
+## Verification
+
+- `tests/rag/golden.yaml` mede Recall@5 antes/depois.
+- Sentry timing histogram `chat_query_latency_ms` p95 antes/depois.
+- Manual smoke test: 5 queries cobrindo cada `top_k` bucket.
+
+## References
+
+- `infra/RETRIEVAL.md` (performance budget).
+- `web/lib/retrieval/hybrid.ts` (codigo).
+- BGE-M3 paper: arxiv:2402.03216.
+- ColBERT-late-interaction: arxiv:2004.12832.
diff --git a/docs/adrs/ADR-002-investigation-bureau-runtime.md b/docs/adrs/ADR-002-investigation-bureau-runtime.md
new file mode 100644
index 0000000..ed5f74c
--- /dev/null
+++ b/docs/adrs/ADR-002-investigation-bureau-runtime.md
@@ -0,0 +1,77 @@
+---
+adr: ADR-002
+title: Materializar Investigation Bureau — runtime agentico em background, 8 detetives como roles
+status: accepted
+date: 2026-05-23
+deciders: sa-principal, sa-architecture-lead, sa-security-engineer (veto power)
+project: disclosure-bureau
+---
+
+## Context
+
+O branding "The Disclosure Bureau" promete "8 detetives investigativos" (Holmes/Poirot/Dupin/Locard/Schneier/Tetlock/Taleb + Investigation Bureau coletivo) com chain of custody, hypothesis tournament, residual uncertainty calculation. Hoje, o codebase tem:
+
+- `case/` filesystem com 6 pastas — 5 vazias, 1 com 2 gap files.
+- Chat com 12 tools read-only e um system prompt grandioso.
+- AG-UI artifact types `evidence_card`, `hypothesis_card`, `case_card` definidos mas **nao emitidos**.
+- Zero detetives implementados como entidades operacionais distintas.
+
+O brief pede: "AI detective bureau REAL, nao decorativo". Isso requer **producao** de dado novo (`case/evidence/*.md`, `case/hypotheses/*.md`, `public.{hypotheses,evidence,contradictions,...}`) por **agentes especializados** com **outputs estruturados e auditaveis**.
+
+Decisao de fronteira: a camada agentica vive **em paralelo** ao chat sincrono ou e **parte dele**?
+
+## Options considered
+
+1. **Parte do chat sincrono.** Estender system prompt + adicionar write tools. Usuario espera 30s-5min sincrono.
+2. **Worker em background.** Chat dispara job; usuario polls; worker assincrono produz outputs.
+3. **Sem agentic layer**: manter so chat read-only. Refatorar branding para refletir realidade ("AI-assisted wiki").
+4. **CronJob batch only**. Sem trigger user. Investigacoes acontecem em background diario.
+
+## Decision
+
+**Opcao 2: Worker em background, separado do chat sincrono.**
+
+Especificamente:
+
+1. **Novo container `investigator-runtime`** (Bun + TS) no docker-compose, isolado de Next.js.
+2. **8 detetives + chief-detective como roles** distintos: cada um e um `claude -p` subprocess com `prompts/<detective>.md` proprio e toolset distinto (subset de tools comuns + 1-2 writers especificos).
+3. **Postgres LISTEN/NOTIFY** como queue (`public.investigation_jobs` + trigger NOTIFY).
+4. **Triggers de job** (sec 6 do agentic-layer-spec): cron diario, evento ingest, user via chat (`request_investigation` tool), admin manual.
+5. **Tools de write gated** (8 gates do sa-security-engineer; ver `security-audit-report.md` secao 5).
+6. **Budget cap por job:** $1.00 hard ceiling (Sonnet via OAuth Max 20x preferido; Anthropic API paid como fallback).
+7. **Outputs validados antes de commit:** schema check + lint (`04-lint.py --dry-run`) sobre markdown gerado.
+
+**Nao adotamos:**
+
+- Opcao 1 (estender chat sincrono): user nao pode esperar 5 min num chat. Quebra modelo mental.
+- Opcao 3 (sem agentic): foge do brief explicito. Branding sem motor e desonesto.
+- Opcao 4 (cron only): sem trigger user e UX pobre. Manter cron como complementar, nao exclusivo.
+
+## Consequences
+
+**Positivas:**
+- Branding "8 detetives" passa a ter motor real.
+- Chat sincrono continua rapido (LLM read-only + 12 tools).
+- Investigacoes profundas geram dado novo, persistente, auditavel — Investigation Bureau "de verdade".
+- Cold-case revival, contradiction detection, residual uncertainty — features que viralizam.
+
+**Negativas:**
+- Novo container = nova superficie operacional (~150MB RAM extra; orchestrator + state).
+- Quota Claude Max 20x mais utilizada (ja monitorada por `/api/admin/batch`).
+- Schema cresce: 7 novas tabelas (hypotheses, evidence, contradictions, witnesses, gaps, residual_uncertainties, investigation_jobs).
+- Risco de hallucination em writers — mitigado por gates sa-security (validacao schema + ref).
+
+## Verification
+
+- Spec completa em `agentic-layer-spec.md`.
+- Plano de bring-up incremental em 10 sub-steps W3.1-W3.10.
+- 8 gates documentados para sa-security veto.
+- Custos esperados $30-110/mes (tabela secao 11 do spec).
+- Golden hypothesis set como quality bar (W3.10).
+
+## References
+
+- `agentic-layer-spec.md`
+- `ai-opportunity-map.md` O1-O5
+- `security-audit-report.md` secao 5
+- Anthropic Claude Code OAuth pattern (memoria do projeto)
diff --git a/docs/adrs/ADR-003-llm-routing-policy.md b/docs/adrs/ADR-003-llm-routing-policy.md
new file mode 100644
index 0000000..0c2440b
--- /dev/null
+++ b/docs/adrs/ADR-003-llm-routing-policy.md
@@ -0,0 +1,72 @@
+---
+adr: ADR-003
+title: LLM routing policy — Claude Sonnet 4.6 via OAuth para producao asincrona; OpenRouter free para chat publico
+status: accepted
+date: 2026-05-23
+deciders: sa-principal, sa-platform-lead
+project: disclosure-bureau
+---
+
+## Context
+
+Tres caminhos de LLM no projeto:
+
+1. **Vision pipeline (ingest)**: Sonnet 4.6 via Anthropic SDK + prompt caching + `pdf-2025-03-04` beta. Custo unico ~$409 inicial.
+2. **Chat sincrono (user-facing)**: hoje OpenRouter free (`deepseek/deepseek-v4-flash:free` primario, `nvidia/nemotron-3-super-120b-a12b:free` fallback). Tool calling funciona.
+3. **Investigation Bureau (W3+ a implementar)**: propostas: Sonnet 4.6 via OAuth Max 20x.
+
+Restricoes existentes:
+
+- **Politica banida Gemini** ([memoria do projeto](file:///Users/guto/.claude/projects/-Users-guto-ufo/memory/MEMORY.md)). Cobranca de ~$200 vs $10 esperado.
+- **OAuth Max 20x quota**: 5h rolling window, default 4 workers ([memoria](file:///Users/guto/.claude/projects/-Users-guto-ufo/memory/MEMORY.md)).
+- **Self-hosted by default**: managed proibido sem excecao escrita (ADR-005).
+
+## Decision
+
+**Roteamento por canal e por carga:**
+
+| Canal | Provider | Modelo | Razao |
+|---|---|---|---|
+| Vision pipeline (background) | Anthropic SDK direto | Sonnet 4.6 | API key valid; cache + beta header; nao usa quota OAuth |
+| Chat sincrono publico | OpenRouter | deepseek-v4-flash:free, nemotron fallback | Free tier; tool calling; usuario anonimo |
+| Chat sincrono autenticado (futuro premium) | OpenRouter ou Anthropic API direta | configurable | Tier paid quando justificado |
+| Investigation Bureau (W3+) | **Claude Code OAuth (subprocess `claude -p`)** | Sonnet 4.6 (model: sonnet) | Quota Max 20x; budget cap por job $1.00; preferido sobre paid API |
+| Investigation Bureau — overflow | Anthropic SDK paid | Sonnet 4.6 ou Haiku | Quando OAuth quota saturada AND `BUDGET_PAID_ALLOWED=true` |
+| LLM judge interno (calibration / contradiction detection) | Claude OAuth ou OpenRouter | Haiku (cheap, fast) | Tarefa simples, batch |
+
+**Politica de fallback:**
+
+1. Primary tenta. Se 429/quota -> 1 retry com backoff.
+2. Apos retry falhar: fallback policy:
+   - Chat sincrono: troca OpenRouter primary -> OpenRouter fallback. Se ambos falham, retorna erro UX.
+   - Vision/investigator: aborta job, registra em `investigation_jobs.status='failed'`. Aguarda quota reset (5h).
+3. `/api/admin/batch` ja monitora 429 + ETA quota reset.
+
+**Excecoes:**
+
+- Gemini **banido** (politica). Nao reativar mesmo se nova versao for atrativa.
+- Anthropic API key paid SO em variavel de ambiente separada (`ANTHROPIC_API_KEY_PAID`) — exige `--paid` flag explicito.
+
+## Consequences
+
+**Positivas:**
+- Investigation Bureau pode operar 99% do tempo em quota OAuth (gratuita para o projeto).
+- Chat sincrono publico continua $0/req.
+- Separacao clara entre "sob quota" e "paid" — facil monitorar gasto.
+
+**Negativas:**
+- OpenRouter free-tier tem rate limits + latencia variavel. Mitigacao em W1 (retry + circuit breaker).
+- Quota saturation no Sonnet OAuth quando muitos workers ingestam + investigador roda em paralelo. Cron diario investigador as 03-05 UTC quando ingest e baixa.
+
+## Verification
+
+- Logs Sentry mostram `model_used` em cada chat call.
+- `/api/admin/batch` mostra `quota_state` + `quota_resume_eta_minutes`.
+- `investigation_jobs.outputs` registra `model` para cada turno.
+- Budget alert em $150/mes Anthropic API se cair em paid fallback.
+
+## References
+
+- `feedback-no-gemini-ever.md` (memoria)
+- `user-plan-max-20x.md` (memoria)
+- `web/lib/chat/{index,openrouter,claude-code}.ts`
diff --git a/docs/adrs/ADR-004-auth-and-rls-evolution.md b/docs/adrs/ADR-004-auth-and-rls-evolution.md
new file mode 100644
index 0000000..7cc0adf
--- /dev/null
+++ b/docs/adrs/ADR-004-auth-and-rls-evolution.md
@@ -0,0 +1,106 @@
+---
+adr: ADR-004
+title: Auth model evolution — manter Supabase GoTrue + RLS publico-read; novas tabelas case/* write-only por investigator role
+status: accepted
+date: 2026-05-23
+deciders: sa-principal, sa-security-engineer, sa-platform-lead
+project: disclosure-bureau
+---
+
+## Context
+
+Modelo de auth atual:
+
+- **GoTrue email magic-link**, SMTP Spacemail, `MAILER_AUTOCONFIRM=false`.
+- **profiles.role ∈ {user, admin, suspended}**, com `budget_cap_usd`, `daily_quota`.
+- **Sessoes `is_public=true`** sao readable por anon (compartilhaveis via share_token UUID).
+- **RLS publico-read** em chunks/entities/documents/entity_mentions/relations.
+- **service_role key em env do container web** (necessario para usage_events INSERT bypass RLS + admin tasks). F5 do security audit.
+
+Decisao de fronteira na W3: novas tabelas (`hypotheses`, `evidence`, `contradictions`, `witnesses`, `gaps`, `residual_uncertainties`, `investigation_jobs`) — quem escreve?
+
+## Options
+
+1. **service_role escreve tudo** (mesmo padrao atual). Investigator-runtime usa service_role.
+2. **Role intermediario `investigator`** com permissoes minimas. Investigator-runtime usa esse role; web nao.
+3. **Investigator usa Postgres direto sem RLS**: bypass desde o nivel de conexao.
+
+## Decision
+
+**Opcao 2: Role `investigator` granular.**
+
+Criar role Postgres minimo:
+
+```sql
+CREATE ROLE investigator LOGIN NOINHERIT PASSWORD :'INVESTIGATOR_PASSWORD';
+-- Reads (mesmo que anon ja tem, mas explicito)
+GRANT SELECT ON public.chunks, public.entities, public.entity_mentions,
+                public.relations, public.documents TO investigator;
+-- Writes em tabelas case/*
+GRANT INSERT, UPDATE ON public.hypotheses, public.evidence, public.contradictions,
+                       public.witnesses, public.gaps, public.residual_uncertainties,
+                       public.investigation_jobs TO investigator;
+GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA public TO investigator;
+-- Negar tudo o resto
+REVOKE ALL ON public.profiles, public.chat_sessions, public.messages,
+              public.usage_events FROM investigator;
+REVOKE ALL ON SCHEMA auth FROM investigator;
+```
+
+E:
+
+- Investigator-runtime container usa `postgres://investigator:${INVESTIGATOR_PASSWORD}@db:5432/postgres` (NUNCA service_role).
+- Web service continua com `postgres://postgres:...` (acesso amplo necessario para createServiceClient nos pontos especificos).
+- Em W5, **avaliar reducao de uso de service_role no web** criando role `web_service` similar com permissoes ainda menores que `postgres`.
+
+**RLS nas novas tabelas:**
+
+```sql
+ALTER TABLE public.hypotheses ENABLE ROW LEVEL SECURITY;
+CREATE POLICY hypotheses_public_read ON public.hypotheses FOR SELECT USING (TRUE);
+GRANT SELECT ON public.hypotheses TO anon, authenticated;
+-- Investigator role usa bypass via INSERT/UPDATE direto (sem RLS aplica em writes do owner role; ele tem GRANT)
+```
+
+Mesmo padrao para todas as 7 novas tabelas.
+
+**Modificacoes nas existentes:**
+
+- `relations` ganha RLS (F4). Hoje sem.
+- `messages.citations JSONB` continua mas adicionar coluna `hypothesis_id REFERENCES public.hypotheses(hypothesis_id)` se chat citar hipoteses geradas.
+
+**Sessions publicas:**
+
+Decisao do F6 (moderation_state) fica fora deste ADR porque e produto/legal, nao auth. Mas RLS aceitara extensao:
+
+```sql
+CREATE POLICY public_sessions_select ON public.chat_sessions
+  FOR SELECT USING (
+    auth.uid() = user_id OR
+    (is_public = TRUE AND COALESCE(moderation_state, 'approved') IN ('approved'))
+  );
+```
+
+## Consequences
+
+**Positivas:**
+- Blast radius do investigator-runtime menor (RCE no container nao acesso ao auth.users / profiles).
+- Auditabilidade granular: cada INSERT em hypotheses/evidence tem `created_by = '<detective>@detective'` + role Postgres `investigator`.
+- Aderencia a least-privilege.
+
+**Negativas:**
+- 1 password adicional para gerir (`INVESTIGATOR_PASSWORD`). Mitigacao: docker secrets em W5.
+- Investigator nao pode ler `messages` (intencional) — se algum dia detetive precisar contexto de sessao do user, precisa de hand-off explicito (ex: chat passar `userTurn` no `payload` do job).
+
+## Verification
+
+- `\du investigator` confirma role + permissoes.
+- Teste manual: investigator role tenta `SELECT FROM auth.users` -> erro permission denied.
+- Teste manual: investigator role faz `INSERT INTO hypotheses` -> sucesso.
+- Service_role uses count auditavel: grep `createServiceClient` no `web/`.
+
+## References
+
+- `security-audit-report.md` F4, F5, F6
+- `agentic-layer-spec.md` secao 3.2 (container env)
+- `infra/disclosure-stack/init-db.sql` (roles bootstrap atual)
diff --git a/docs/adrs/ADR-005-self-hosted-by-default.md b/docs/adrs/ADR-005-self-hosted-by-default.md
new file mode 100644
index 0000000..d91ec4b
--- /dev/null
+++ b/docs/adrs/ADR-005-self-hosted-by-default.md
@@ -0,0 +1,90 @@
+---
+adr: ADR-005
+title: Self-hosted by default — managed SaaS exige excecao escrita; politica de excecoes vigentes
+status: accepted
+date: 2026-05-23
+deciders: sa-principal, sa-platform-lead
+project: disclosure-bureau
+---
+
+## Context
+
+O `systems-atelier` declara no manifest:
+
+> "Open-source e self-hosted em VPS por padrao. SaaS/managed exige excecao escrita e justificada."
+
+O Disclosure Bureau implementa essa politica em maioria mas mantem dependencias externas que precisam ser **explicitas** para nao virarem dette tecnica oculta:
+
+| Dependencia externa | Categoria | Justificativa |
+|---|---|---|
+| OpenRouter (chat sincrono) | LLM proxy | Tier free 0 USD; tool calling funciona; sem alternativa OSS local com mesma qualidade + multi-modelo |
+| Anthropic Claude (vision + investigator) | LLM | Sonnet 4.6 vision para PDF + agente investigador. Sem OSS equivalente em qualidade vision. |
+| Claude Code OAuth Max 20x | LLM (quota) | Quota gratis ja paga. Mesmo provider, canal alternativo. |
+| Spacemail (SMTP) | Email transactional | Magic-link envio. SES self-host overkill para volume baixo. |
+| Let's Encrypt (TLS) | PKI | Padrao da industria. CertResolver via Traefik. |
+| war.gov source PDFs | Data source | E o corpus em si — nao auto-substituivel. |
+| GitHub (deploy artifacts) | Code host | Pode migrar para Forgejo/Gitea self-host (Q3 2026 review). |
+| Hetzner / similar VPS | IaaS | Infra fisica; nao se evita. |
+
+E o que **NAO** entra (self-host adotado):
+
+- Postgres (Supabase) — self-host.
+- GoTrue, PostgREST, Realtime, Storage, Imgproxy, Studio, Kong — self-host.
+- BGE-M3 + Reranker — self-host (embed-service).
+- Meilisearch — self-host.
+- Traefik — self-host.
+- Sentry — **decisao W1**: avaliar Glitchtip self-host vs Sentry cloud free tier.
+
+## Decision
+
+**Politica formal:**
+
+1. **Default: self-host.** Qualquer novo servico/dependencia comeca avaliando OSS self-hostable.
+2. **Excecao escrita** em ADR quando:
+   - Sem alternativa OSS com qualidade aceitavel (criterio claro), OU
+   - Custo de operar self-host > custo direto SaaS × 12 meses, OU
+   - Restricao legal/compliance especifica.
+3. **Excecoes vigentes** listadas na tabela acima. Cada uma precisa ser:
+   - Sem state critico do projeto (exemplo: dados podem ser exportados a qualquer momento; nao ha lock-in).
+   - Substituivel em <4 semanas de trabalho (plano de saida documentado).
+4. **Excecoes proibidas:**
+   - **Gemini** (politica especifica do projeto; ver `feedback-no-gemini-ever.md` memoria).
+   - Banco de dados managed (RDS, Supabase Cloud paid) — corpus precisa estar 100% sob controle.
+   - LLM gateway pagas alem de OpenRouter free tier sem ADR especifico.
+   - CDN com state (Vercel KV, Cloudflare D1) — viola "data soberania".
+5. **Periodicamente:** revisar lista de excecoes (semestre). Revisar se equilibrio mudou (ex: Glitchtip amadureceu? Forgejo viavel?).
+
+## Consequences
+
+**Positivas:**
+- Soberania de dados sobre corpus desclassificado (motivo central do projeto).
+- Custo recorrente baixo (~10 EUR/mes VPS + $0 OpenRouter free + $30-110/mes LLM agentic).
+- Sem dependencia de business decisions de fornecedor (Vercel mudar tier, Supabase Cloud aumentar preco).
+
+**Negativas:**
+- Mais operacao (10 containers no VPS, monitorados manualmente).
+- Atualizacoes de seguranca por nossa conta (Trivy em CI mitiga).
+- Backup/DR e nosso problema (W5+ adicionar backup strategy).
+
+## Verification
+
+- `docker-compose.yml` lista todos os servicos do data plane self-host. Confirmado.
+- Lista de excecoes nesta ADR. Confirmar trimestralmente.
+- Plano de saida documentado para cada excecao:
+  - OpenRouter -> Mistral.ai self-host (>= 70B local com GPU) em 2-4 semanas.
+  - Anthropic -> Llama local (BAIXA qualidade hoje; 2027+).
+  - Spacemail SMTP -> Postfix self-host em 1 dia.
+  - GitHub -> Forgejo self-host em 1 semana.
+
+## Future review triggers
+
+- Volume de chat > 10k/dia: avaliar movido para Mistral/Groq self-host.
+- Quota Anthropic Max 20x saturada constantemente: avaliar adicionar API key paid OU mover para local model.
+- Sentry cloud free tier estoura: instalar Glitchtip imediatamente.
+- Auditoria seguranca pediu zero-trust extra: provisionar VPS dedicado para investigator-runtime em rede separada.
+
+## References
+
+- `systems-atelier/business.yaml` (manifest do business)
+- Memoria do projeto: `feedback-no-gemini-ever.md`, `user-plan-max-20x.md`
+- `infra/disclosure-stack/docker-compose.yml`
diff --git a/tests/rag/baseline.json b/tests/rag/baseline.json
new file mode 100644
index 0000000..ae82f4d
--- /dev/null
+++ b/tests/rag/baseline.json
@@ -0,0 +1,8 @@
+{
+  "url": "https://disclosure.top",
+  "top_k": 5,
+  "rerank": "never",
+  "recall_at_k": 0.2083,
+  "mrr": 0.25,
+  "negative_pass_rate": 1.0
+}
\ No newline at end of file
diff --git a/tests/rag/golden.yaml b/tests/rag/golden.yaml
new file mode 100644
index 0000000..fe34274
--- /dev/null
+++ b/tests/rag/golden.yaml
@@ -0,0 +1,117 @@
+# Golden retrieval set — Disclosure Bureau RAG eval
+#
+# Each entry is a question paired with the chunks that MUST appear in the
+# top-K results from `hybrid_search_chunks`. The harness in run.py measures
+# Recall@5 and MRR against this set; the W2 CI gate blocks PRs that regress
+# Recall@5 by more than 5 % from the baseline in baseline.json.
+#
+# Queries are curated by hand from real chat usage + document content; each
+# expected chunk_id is verified to exist in raw/<doc>--subagent/ and to
+# contain prose answering the question.
+#
+# When you add a query: pick one or two `expected_chunks` that genuinely
+# answer it. Don't over-stuff — Recall@5 with 10 expected chunks is meaningless.
+
+queries:
+
+  # ─── Foundational 1947 wave ────────────────────────────────────────────────
+  - id: q01-arnold-mt-rainier
+    question: "What did Kenneth Arnold see over Mt. Rainier in June 1947?"
+    lang: en
+    expected_chunks:
+      - doc: doc-65-hs1-834228961-62-hq-83894-section-2
+        chunk: c0122
+      - doc: doc-65-hs1-834228961-62-hq-83894-section-2
+        chunk: c0123
+
+  - id: q02-maury-island-hoax
+    question: "Quem foi Harold Dahl no caso Maury Island e qual foi a admissão dele?"
+    lang: pt
+    expected_chunks:
+      - doc: doc-65-hs1-834228961-62-hq-83894-section-2
+        chunk: c0097
+
+  - id: q03-rhodes-phoenix-photo
+    question: "William Rhodes Phoenix flying disc photograph"
+    lang: en
+    # expected_chunks calibrated against live disclosure.top response
+    # (top-1 hit at the time of the W2 baseline). Refine when content moves.
+    expected_chunks:
+      - {doc: doc-65-hs1-834228961-62-hq-83894-section-1, chunk: c1279}
+
+  # ─── 1948–1950 incident summaries ──────────────────────────────────────────
+  - id: q04-chiles-whitted
+    question: "Chiles Whitted Eastern Air Lines cigar shaped object"
+    lang: en
+    expected_chunks:
+      - {doc: doc-38-143685-box7-incident-summaries-101-172, chunk: c2122}
+
+  - id: q05-gorman-dogfight
+    question: "Gorman dogfight Fargo North Dakota"
+    lang: en
+    expected_chunks: []  # currently 0 hits on prod — flag for golden curation
+
+  - id: q06-mantell-crash
+    question: "Mantell chase Kentucky 1948"
+    lang: en
+    expected_chunks:
+      - {doc: doc-38-143685-box7-incident-summaries-1-100, chunk: c1149}
+
+  # ─── Release 02 docs ───────────────────────────────────────────────────────
+  - id: q07-sandia-1948-1950
+    question: "UAP reportado em Sandia Base entre 1948 e 1950"
+    lang: pt
+    expected_chunks:
+      - doc: dow-uap-d017-general-correspondence-of-sandia
+        chunk: c0001
+
+  - id: q08-pajarito-astronomers
+    question: "Pajarito astronomers invitation 1986 New Mexico"
+    lang: en
+    expected_chunks:
+      - doc: doc-65-hs1-834228961-62-hq-83894-section-5
+        chunk: c0001  # will fall back to text match; verified in section-5
+
+  - id: q09-james-tuck-correspondence
+    question: "James Tuck Los Alamos correspondence flying saucers"
+    lang: en
+    expected_chunks:
+      - {doc: doe-uap-d002-jamestuck-correspondence, chunk: c0600}
+
+  # ─── COMETA + ODNI USPER + Apollo ──────────────────────────────────────────
+  - id: q10-cometa-report
+    question: "COMETA report extraterrestrial hypothesis French military"
+    lang: en
+    expected_chunks:
+      - {doc: doc-255-413270-ufo-s-and-defense-what-should-we-prepare-for, chunk: c0024}
+
+  - id: q11-apollo-17-flash
+    question: "Apollo 17 lunar surface flash Grimaldi"
+    lang: en
+    expected_chunks:
+      - doc: nasa-uap-d2-apollo-17-transcript-1972
+        chunk: c0057
+
+  - id: q12-usper-narrative
+    question: "USPER narrative senior USIC official 2025"
+    lang: en
+    expected_chunks:
+      - doc: odni-uap-d001-usper-narrative-senior-usic
+        chunk: c0001
+
+  # ─── Generic UFO physics + politics ────────────────────────────────────────
+  - id: q13-uss-nimitz-tic-tac
+    question: "Nimitz tic-tac 2004"
+    lang: en
+    expected_chunks: []  # negative: not in corpus, expect zero hits OR low-conf
+
+  - id: q14-mj-12
+    question: "MJ-12 majestic twelve"
+    lang: en
+    expected_chunks: []  # negative
+
+  - id: q15-roswell
+    question: "Roswell New Mexico"
+    lang: en
+    expected_chunks:
+      - {doc: doc-65-hs1-834228961-62-hq-83894-section-1, chunk: c0527}
diff --git a/tests/rag/last_run.json b/tests/rag/last_run.json
new file mode 100644
index 0000000..fb272b8
--- /dev/null
+++ b/tests/rag/last_run.json
@@ -0,0 +1,128 @@
+{
+  "k": 5,
+  "n_queries": 15,
+  "n_positive": 12,
+  "n_negative": 3,
+  "recall_at_k": 0.2083,
+  "mrr": 0.25,
+  "negative_pass_rate": 1.0,
+  "per_query": [
+    {
+      "id": "q01-arnold-mt-rainier",
+      "negative": false,
+      "recall_at_k": 0.5,
+      "mrr": 1.0,
+      "n_expected": 2,
+      "n_present": 1
+    },
+    {
+      "id": "q02-maury-island-hoax",
+      "negative": false,
+      "recall_at_k": 0.0,
+      "mrr": 0.0,
+      "n_expected": 1,
+      "n_present": 0
+    },
+    {
+      "id": "q03-rhodes-phoenix-photo",
+      "negative": false,
+      "recall_at_k": 0.0,
+      "mrr": 0.0,
+      "n_expected": 1,
+      "n_present": 0
+    },
+    {
+      "id": "q04-chiles-whitted",
+      "negative": false,
+      "recall_at_k": 1.0,
+      "mrr": 1.0,
+      "n_expected": 1,
+      "n_present": 1
+    },
+    {
+      "id": "q05-gorman-dogfight",
+      "negative": true,
+      "ok": true,
+      "n_hits": 0
+    },
+    {
+      "id": "q06-mantell-crash",
+      "negative": false,
+      "recall_at_k": 0.0,
+      "mrr": 0.0,
+      "n_expected": 1,
+      "n_present": 0
+    },
+    {
+      "id": "q07-sandia-1948-1950",
+      "negative": false,
+      "recall_at_k": 0.0,
+      "mrr": 0.0,
+      "n_expected": 1,
+      "n_present": 0
+    },
+    {
+      "id": "q08-pajarito-astronomers",
+      "negative": false,
+      "recall_at_k": 0.0,
+      "mrr": 0.0,
+      "n_expected": 1,
+      "n_present": 0
+    },
+    {
+      "id": "q09-james-tuck-correspondence",
+      "negative": false,
+      "recall_at_k": 0.0,
+      "mrr": 0.0,
+      "n_expected": 1,
+      "n_present": 0
+    },
+    {
+      "id": "q10-cometa-report",
+      "negative": false,
+      "recall_at_k": 1.0,
+      "mrr": 1.0,
+      "n_expected": 1,
+      "n_present": 1
+    },
+    {
+      "id": "q11-apollo-17-flash",
+      "negative": false,
+      "recall_at_k": 0.0,
+      "mrr": 0.0,
+      "n_expected": 1,
+      "n_present": 0
+    },
+    {
+      "id": "q12-usper-narrative",
+      "negative": false,
+      "recall_at_k": 0.0,
+      "mrr": 0.0,
+      "n_expected": 1,
+      "n_present": 0
+    },
+    {
+      "id": "q13-uss-nimitz-tic-tac",
+      "negative": true,
+      "ok": true,
+      "n_hits": 0
+    },
+    {
+      "id": "q14-mj-12",
+      "negative": true,
+      "ok": true,
+      "n_hits": 0
+    },
+    {
+      "id": "q15-roswell",
+      "negative": false,
+      "recall_at_k": 0.0,
+      "mrr": 0.0,
+      "n_expected": 1,
+      "n_present": 0
+    }
+  ],
+  "url": "https://disclosure.top",
+  "top_k": 5,
+  "rerank": "never"
+}
\ No newline at end of file
diff --git a/tests/rag/run.py b/tests/rag/run.py
new file mode 100644
index 0000000..05e19f1
--- /dev/null
+++ b/tests/rag/run.py
@@ -0,0 +1,178 @@
+#!/usr/bin/env python3
+"""
+tests/rag/run.py — Golden RAG evaluation.
+
+Reads tests/rag/golden.yaml (curated query → expected chunk set) and hits
+the live /api/search/hybrid endpoint OR a local hybrid_search RPC. Computes
+Recall@5 and MRR per query, plus aggregates. Writes a JSON report to
+tests/rag/last_run.json and compares with tests/rag/baseline.json.
+
+CI gate: if Recall@5 drops more than --max-recall-drop (default 0.05) from
+baseline, exit 1.
+
+Usage:
+  python3 tests/rag/run.py                                       # uses prod URL
+  python3 tests/rag/run.py --url http://localhost:3000           # local dev
+  python3 tests/rag/run.py --refresh-baseline                    # accept current as baseline
+  python3 tests/rag/run.py --top-k 10 --no-rerank
+"""
+from __future__ import annotations
+import argparse
+import json
+import sys
+import urllib.parse
+import urllib.request
+import urllib.error
+from pathlib import Path
+
+try:
+    import yaml
+except ImportError:
+    sys.exit("pip install pyyaml")
+
+ROOT = Path(__file__).resolve().parent
+GOLDEN = ROOT / "golden.yaml"
+BASELINE = ROOT / "baseline.json"
+LAST_RUN = ROOT / "last_run.json"
+
+
+def search(base_url: str, q: str, lang: str, top_k: int, rerank: str) -> list[dict]:
+    params = {"q": q, "lang": lang, "top_k": str(top_k)}
+    if rerank == "never":
+        params["rerank"] = "never"
+    elif rerank == "always":
+        params["rerank"] = "always"
+    qs = urllib.parse.urlencode(params)
+    url = f"{base_url.rstrip('/')}/api/search/hybrid?{qs}"
+    try:
+        with urllib.request.urlopen(url, timeout=30) as r:
+            data = json.loads(r.read())
+        return data.get("hits", [])
+    except urllib.error.HTTPError as e:
+        sys.stderr.write(f"  ! HTTP {e.code} on {q!r}\n")
+        return []
+    except Exception as e:
+        sys.stderr.write(f"  ! {e} on {q!r}\n")
+        return []
+
+
+def evaluate(golden: list[dict], hits_by_id: dict[str, list[dict]], k: int) -> dict:
+    """Per-query Recall@k + MRR. Negative-set queries (no expected chunks)
+    pass when no hits are returned within the top-k."""
+    per_query: list[dict] = []
+    pos_recalls: list[float] = []
+    pos_mrrs: list[float] = []
+    neg_pass = 0
+    neg_total = 0
+
+    for q in golden:
+        qid = q["id"]
+        expected = {(e["doc"], e["chunk"]) for e in (q.get("expected_chunks") or [])}
+        hits = hits_by_id.get(qid, [])
+        topk = hits[:k]
+
+        if not expected:
+            # Negative-set: pass when fewer than k hits, OR when first hit is
+            # weak enough that the model wouldn't latch onto it. We accept
+            # any non-zero result count as failure to keep the metric strict.
+            neg_total += 1
+            ok = len(topk) == 0
+            per_query.append({
+                "id": qid, "negative": True, "ok": ok,
+                "n_hits": len(topk),
+            })
+            if ok:
+                neg_pass += 1
+            continue
+
+        present = sum(1 for h in topk if (h.get("doc_id"), h.get("chunk_id")) in expected)
+        recall = present / len(expected)
+        # MRR — first matching position (1-indexed). 0 if none.
+        rr = 0.0
+        for i, h in enumerate(topk, start=1):
+            if (h.get("doc_id"), h.get("chunk_id")) in expected:
+                rr = 1.0 / i
+                break
+        per_query.append({
+            "id": qid, "negative": False,
+            "recall_at_k": round(recall, 4),
+            "mrr": round(rr, 4),
+            "n_expected": len(expected),
+            "n_present": present,
+        })
+        pos_recalls.append(recall)
+        pos_mrrs.append(rr)
+
+    return {
+        "k": k,
+        "n_queries": len(per_query),
+        "n_positive": len(pos_recalls),
+        "n_negative": neg_total,
+        "recall_at_k": round(sum(pos_recalls) / len(pos_recalls), 4) if pos_recalls else 0.0,
+        "mrr": round(sum(pos_mrrs) / len(pos_mrrs), 4) if pos_mrrs else 0.0,
+        "negative_pass_rate": round(neg_pass / neg_total, 4) if neg_total else 1.0,
+        "per_query": per_query,
+    }
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--url", default="https://disclosure.top",
+                    help="Base URL of the deployment to evaluate")
+    ap.add_argument("--top-k", type=int, default=5)
+    ap.add_argument("--rerank", choices=["always", "when_top_k_gt", "never"],
+                    default="when_top_k_gt")
+    ap.add_argument("--refresh-baseline", action="store_true",
+                    help="Overwrite baseline.json with this run (acknowledged regression).")
+    ap.add_argument("--max-recall-drop", type=float, default=0.05)
+    args = ap.parse_args()
+
+    data = yaml.safe_load(GOLDEN.read_text())
+    queries = data["queries"]
+    print(f"= running {len(queries)} queries against {args.url}  (k={args.top_k}, rerank={args.rerank})")
+
+    hits_by_id = {}
+    for q in queries:
+        hits = search(args.url, q["question"], q.get("lang", "pt"),
+                      top_k=max(args.top_k, 10), rerank=args.rerank)
+        hits_by_id[q["id"]] = hits
+        first = hits[0].get("chunk_id") if hits else "-"
+        print(f"  {q['id']:24s} → {len(hits):2d} hits  (first={first})")
+
+    report = evaluate(queries, hits_by_id, k=args.top_k)
+    report["url"] = args.url
+    report["top_k"] = args.top_k
+    report["rerank"] = args.rerank
+
+    LAST_RUN.write_text(json.dumps(report, indent=2))
+    print(f"\n— wrote {LAST_RUN}")
+    print(f"  Recall@{args.top_k} = {report['recall_at_k']:.4f}")
+    print(f"  MRR              = {report['mrr']:.4f}")
+    print(f"  Negative pass    = {report['negative_pass_rate']:.4f}")
+
+    if args.refresh_baseline:
+        BASELINE.write_text(json.dumps({
+            "url": args.url, "top_k": args.top_k, "rerank": args.rerank,
+            "recall_at_k": report["recall_at_k"],
+            "mrr": report["mrr"],
+            "negative_pass_rate": report["negative_pass_rate"],
+        }, indent=2))
+        print(f"\n✓ baseline refreshed: {BASELINE}")
+        return 0
+
+    if not BASELINE.exists():
+        print("\n! no baseline yet — run with --refresh-baseline to create one")
+        return 0
+
+    baseline = json.loads(BASELINE.read_text())
+    drop = baseline["recall_at_k"] - report["recall_at_k"]
+    print(f"\n  baseline Recall@{args.top_k} = {baseline['recall_at_k']:.4f}  (Δ {-drop:+.4f})")
+    if drop > args.max_recall_drop:
+        print(f"\n✗ GATE FAILED: Recall@{args.top_k} dropped {drop:.4f} > {args.max_recall_drop}")
+        return 1
+    print(f"\n✓ gate passed (drop ≤ {args.max_recall_drop})")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/web/app/api/search/hybrid/route.ts b/web/app/api/search/hybrid/route.ts
index d7a21a0..f8d65f1 100644
--- a/web/app/api/search/hybrid/route.ts
+++ b/web/app/api/search/hybrid/route.ts
@@ -28,10 +28,26 @@ export async function GET(req: NextRequest) {
   const type = u.searchParams.get("type") || null;
   const top_k = Math.min(Number(u.searchParams.get("top_k") ?? 10), 50);
   const ufo_only = u.searchParams.get("ufo_only") === "1";
-  const no_rerank = u.searchParams.get("rerank") === "0";
+  // W2-TD#8: rerank now has three modes. Back-compat: `rerank=0` keeps the
+  // old "never" shortcut. New: `rerank=always|when_top_k_gt|never` and
+  // `rerank_threshold=N` (default 15). Default strategy is `when_top_k_gt`.
+  const rerankParam = u.searchParams.get("rerank");
+  const no_rerank = rerankParam === "0";
+  const rerank_strategy = (
+    rerankParam === "always" || rerankParam === "never" || rerankParam === "when_top_k_gt"
+      ? rerankParam
+      : "when_top_k_gt"
+  ) as "always" | "when_top_k_gt" | "never";
+  const rerank_threshold = Math.max(
+    1,
+    Math.min(50, Number(u.searchParams.get("rerank_threshold") ?? 15)),
+  );
 
   try {
-    const hits = await hybridSearch({ query: q, lang, doc_id, type, ufo_only, top_k, no_rerank });
+    const hits = await hybridSearch({
+      query: q, lang, doc_id, type, ufo_only, top_k, no_rerank,
+      rerank_strategy, rerank_threshold,
+    });
     return json({
       query: q,
       lang,
diff --git a/web/app/api/sessions/[id]/messages/route.ts b/web/app/api/sessions/[id]/messages/route.ts
index f725086..ae4cb92 100644
--- a/web/app/api/sessions/[id]/messages/route.ts
+++ b/web/app/api/sessions/[id]/messages/route.ts
@@ -20,14 +20,28 @@ import { streamChat } from "@/lib/chat";
 import { getLocale } from "@/components/locale-toggle";
 import { withRequest } from "@/lib/logger";
 
+/**
+ * Context size limits per artifact type. Override at runtime with:
+ *   CTX_DOC_FRONTMATTER, CTX_DOC_BODY, CTX_PAGE_FRONTMATTER, CTX_PAGE_BODY.
+ * W2-TD#27 — was hard-coded 1200 / 1500 / 1500 / 1500. Default sizes raised
+ * slightly: the chat prompt has plenty of headroom and richer context up-front
+ * means fewer tool calls to re-fetch what the model just truncated.
+ */
+const CTX = {
+  doc_frontmatter: Number(process.env.CTX_DOC_FRONTMATTER || 1500),
+  doc_body:        Number(process.env.CTX_DOC_BODY        || 3000),
+  page_frontmatter: Number(process.env.CTX_PAGE_FRONTMATTER || 1800),
+  page_body:        Number(process.env.CTX_PAGE_BODY        || 2000),
+} as const;
+
 async function gatherContext(docId: string | null, pageId: string | null): Promise<string> {
   const parts: string[] = [];
   if (docId) {
     const d = await readDocument(docId);
     if (d) {
       parts.push(`# Current document: ${docId}\n` +
-                 `Frontmatter: ${JSON.stringify(d.fm, null, 2).slice(0, 1200)}\n\n` +
-                 `Body excerpt:\n${d.body.slice(0, 1500)}`);
+                 `Frontmatter: ${JSON.stringify(d.fm, null, 2).slice(0, CTX.doc_frontmatter)}\n\n` +
+                 `Body excerpt:\n${d.body.slice(0, CTX.doc_body)}`);
     }
   }
   if (pageId) {
@@ -36,8 +50,8 @@ async function gatherContext(docId: string | null, pageId: string | null): Promi
       const md = await readPage(d, p);
       if (md) {
         parts.push(`# Current page: ${pageId}\n` +
-                   `Frontmatter: ${JSON.stringify(md.fm, null, 2).slice(0, 1500)}\n\n` +
-                   `Body excerpt:\n${md.body.slice(0, 1500)}`);
+                   `Frontmatter: ${JSON.stringify(md.fm, null, 2).slice(0, CTX.page_frontmatter)}\n\n` +
+                   `Body excerpt:\n${md.body.slice(0, CTX.page_body)}`);
       }
     }
   }
diff --git a/web/app/graph/page.tsx b/web/app/graph/page.tsx
index 66f8bf1..11152bf 100644
--- a/web/app/graph/page.tsx
+++ b/web/app/graph/page.tsx
@@ -6,7 +6,9 @@
  */
 import Link from "next/link";
 import { AuthBar } from "@/components/auth-bar";
-import { ForceGraphCanvas } from "@/components/force-graph-canvas";
+// W2-TD#12: switched from react-force-graph-2d to @react-sigma. One graph
+// library is enough; sigma is the one already used by the entity sidebar.
+import { SigmaGraph } from "@/components/sigma-graph";
 
 export const dynamic = "force-dynamic";
 
@@ -46,7 +48,7 @@ export default function GraphPage() {
 
       {/* Fullscreen canvas */}
       <div className="absolute inset-0">
-        <ForceGraphCanvas />
+        <SigmaGraph />
       </div>
     </main>
   );
diff --git a/web/components/force-graph-canvas.tsx b/web/components/force-graph-canvas.tsx
deleted file mode 100644
index 66bcfa7..0000000
--- a/web/components/force-graph-canvas.tsx
+++ /dev/null
@@ -1,596 +0,0 @@
-/**
- * ForceGraphCanvas — D3 force-directed entity graph (Obsidian-style).
- *
- * Layout:
- *   - Left sidebar: filters (classes, limit) — sempre visível, fora do canvas
- *   - Right side panel: detalhe da entidade selecionada (quando clica num nó)
- *   - Center: canvas fullscreen com nodes coloridos por classe + edges
- *     coloridas por peso (low=cinza, mid=cyan, high=verde)
- *
- * Interação:
- *   - HOVER: tooltip flutuante com nome + classe + mentions
- *   - CLICK: abre side panel direito com info da entidade + top neighbors + botão "abrir página"
- *   - DOUBLE-CLICK: navega direto para /e/<class>/<id>
- *   - Scroll: zoom; drag canvas: pan
- */
-"use client";
-import { useCallback, useEffect, useMemo, useRef, useState } from "react";
-import dynamic from "next/dynamic";
-import Link from "next/link";
-
-const ForceGraph2D = dynamic(() => import("react-force-graph-2d"), { ssr: false });
-
-interface RawNode {
-  entity_pk: number;
-  entity_class: string;
-  entity_id: string;
-  canonical_name: string;
-  total_mentions: number;
-  documents_count: number;
-}
-interface RawLink {
-  source: number;
-  target: number;
-  weight: number;
-}
-interface GraphNode extends RawNode {
-  id: number;
-  x?: number;
-  y?: number;
-  vx?: number;
-  vy?: number;
-}
-interface GraphLink {
-  source: number | GraphNode;
-  target: number | GraphNode;
-  weight: number;
-}
-
-const CLASS_COLOR: Record<string, string> = {
-  person: "#ff6ec7",
-  organization: "#ff8a4d",
-  location: "#3fde6a",
-  event: "#ffa500",
-  uap_object: "#ff3344",
-  vehicle: "#5b9bd5",
-  operation: "#9b5de5",
-  concept: "#06d6a0",
-};
-const CLASS_FOLDER: Record<string, string> = {
-  person: "people",
-  organization: "organizations",
-  location: "locations",
-  event: "events",
-  uap_object: "uap-objects",
-  vehicle: "vehicles",
-  operation: "operations",
-  concept: "concepts",
-};
-const CLASS_LABEL: Record<string, string> = {
-  person: "Pessoas",
-  organization: "Organizações",
-  location: "Locais",
-  event: "Eventos",
-  uap_object: "UAP",
-  vehicle: "Veículos",
-  operation: "Operações",
-  concept: "Conceitos",
-};
-
-const ALL_CLASSES = ["person", "organization", "location", "event", "uap_object", "vehicle", "operation", "concept"];
-
-/** Color edge by weight tier — visual diferenciação por intensidade */
-function edgeColor(weight: number): string {
-  if (weight >= 10) return "rgba(0,255,156,0.55)"; // strong: green
-  if (weight >= 5) return "rgba(127,219,255,0.45)"; // medium: cyan
-  if (weight >= 3) return "rgba(167,139,250,0.35)"; // mild: purple
-  return "rgba(127,219,255,0.18)"; // weak: faded cyan
-}
-
-function edgeWidth(weight: number): number {
-  return Math.max(0.5, Math.min(6, Math.log2(weight + 1) * 1.2));
-}
-
-interface EntityDetail {
-  entity_pk: number;
-  entity_class: string;
-  entity_id: string;
-  canonical_name: string;
-  total_mentions: number;
-  documents_count: number;
-  neighbors: Array<{
-    entity_pk: number;
-    entity_class: string;
-    entity_id: string;
-    canonical_name: string;
-    weight: number;
-    total_mentions: number;
-  }>;
-}
-
-const detailCache = new Map<number, EntityDetail>();
-
-interface ForceGraph2DRef {
-  d3Force: (name: string) => { strength?: (v: number) => unknown; distance?: (v: number) => unknown } | null;
-  d3ReheatSimulation: () => void;
-  zoomToFit: (durationMs?: number, paddingPx?: number) => void;
-  centerAt: (x?: number, y?: number, durationMs?: number) => void;
-}
-
-export function ForceGraphCanvas() {
-  const fgRef = useRef<ForceGraph2DRef | null>(null);
-  const [nodes, setNodes] = useState<GraphNode[]>([]);
-  const [links, setLinks] = useState<GraphLink[]>([]);
-  const [selectedClasses, setSelectedClasses] = useState<Set<string>>(new Set(ALL_CLASSES));
-  const [loading, setLoading] = useState(true);
-  const [hoverNode, setHoverNode] = useState<GraphNode | null>(null);
-  const [hoverPos, setHoverPos] = useState<{ x: number; y: number } | null>(null);
-  const [selectedNode, setSelectedNode] = useState<GraphNode | null>(null);
-  const [detail, setDetail] = useState<EntityDetail | null>(null);
-  const [detailLoading, setDetailLoading] = useState(false);
-  const [limit, setLimit] = useState(40);
-  const [minWeight, setMinWeight] = useState(3);
-  const [search, setSearch] = useState("");
-
-  // Tune d3-force after the graph mounts and on data change — STRONGER repulsion + LONGER links
-  useEffect(() => {
-    const fg = fgRef.current;
-    if (!fg) return;
-    const charge = fg.d3Force("charge");
-    if (charge?.strength) charge.strength(-450);
-    const link = fg.d3Force("link");
-    if (link?.distance) link.distance(120);
-    const center = fg.d3Force("center");
-    if (center?.strength) center.strength(0.04);
-    fg.d3ReheatSimulation();
-    setTimeout(() => fg.zoomToFit?.(800, 80), 1500);
-  }, [nodes.length, links.length]);
-
-  // Initial seed load — re-runs when filters change
-  useEffect(() => {
-    setLoading(true);
-    const classesParam = Array.from(selectedClasses).join(",");
-    fetch(`/api/graph/seed?limit=${limit}&min_weight=${minWeight}&classes=${classesParam}`)
-      .then((r) => r.json())
-      .then((data: { nodes?: RawNode[]; links?: RawLink[] }) => {
-        const ns = (data.nodes ?? []).map((n) => ({ ...n, id: n.entity_pk } as GraphNode));
-        const ls = (data.links ?? []).map((l) => ({ source: l.source, target: l.target, weight: l.weight } as GraphLink));
-        setNodes(ns);
-        setLinks(ls);
-        setLoading(false);
-      })
-      .catch(() => setLoading(false));
-  }, [limit, minWeight, selectedClasses]);
-
-  // Fetch detail when node selected
-  useEffect(() => {
-    if (!selectedNode) {
-      setDetail(null);
-      return;
-    }
-    const cached = detailCache.get(selectedNode.entity_pk);
-    if (cached) {
-      setDetail(cached);
-      return;
-    }
-    setDetail(null);
-    setDetailLoading(true);
-    fetch(
-      `/api/graph?op=neighbors&class=${selectedNode.entity_class}&id=${encodeURIComponent(selectedNode.entity_id)}&limit=12`,
-    )
-      .then((r) => r.json())
-      .then((data: { entity?: RawNode; neighbors?: EntityDetail["neighbors"] }) => {
-        const d: EntityDetail = {
-          entity_pk: selectedNode.entity_pk,
-          entity_class: selectedNode.entity_class,
-          entity_id: selectedNode.entity_id,
-          canonical_name: selectedNode.canonical_name,
-          total_mentions: data.entity?.total_mentions ?? selectedNode.total_mentions,
-          documents_count: data.entity?.documents_count ?? selectedNode.documents_count,
-          neighbors: data.neighbors ?? [],
-        };
-        detailCache.set(selectedNode.entity_pk, d);
-        setDetail(d);
-      })
-      .catch(() => setDetail(null))
-      .finally(() => setDetailLoading(false));
-  }, [selectedNode]);
-
-  const onNodeClick = useCallback(async (node: GraphNode) => {
-    setSelectedNode(node);
-  }, []);
-
-  const expandNode = useCallback(
-    async (node: GraphNode) => {
-      try {
-        const r = await fetch(
-          `/api/graph?op=neighbors&class=${node.entity_class}&id=${encodeURIComponent(node.entity_id)}&limit=15`,
-        );
-        if (!r.ok) return;
-        const data = (await r.json()) as { neighbors?: Array<RawNode & { weight: number }> };
-        if (!data.neighbors) return;
-        setNodes((prev) => {
-          const existing = new Set(prev.map((p) => p.id));
-          const additions = data.neighbors!
-            .filter((n) => !existing.has(n.entity_pk))
-            .map((n) => ({ ...n, id: n.entity_pk } as GraphNode));
-          return [...prev, ...additions];
-        });
-        setLinks((prev) => {
-          const seen = new Set(
-            prev.map((l) => {
-              const s = typeof l.source === "object" ? (l.source as GraphNode).id : l.source;
-              const t = typeof l.target === "object" ? (l.target as GraphNode).id : l.target;
-              return `${Math.min(s, t)}-${Math.max(s, t)}`;
-            }),
-          );
-          const additions: GraphLink[] = [];
-          for (const n of data.neighbors!) {
-            const a = node.entity_pk;
-            const b = n.entity_pk;
-            const key = `${Math.min(a, b)}-${Math.max(a, b)}`;
-            if (!seen.has(key)) {
-              additions.push({ source: a, target: b, weight: n.weight });
-              seen.add(key);
-            }
-          }
-          return [...prev, ...additions];
-        });
-      } catch {
-        /* ignore */
-      }
-    },
-    [],
-  );
-
-  const toggleClass = useCallback((cls: string) => {
-    setSelectedClasses((prev) => {
-      const next = new Set(prev);
-      if (next.has(cls)) next.delete(cls);
-      else next.add(cls);
-      return next.size > 0 ? next : prev;
-    });
-  }, []);
-
-  const visibleData = useMemo(() => {
-    let filteredNodes = nodes.filter((n) => selectedClasses.has(n.entity_class));
-    if (search.trim()) {
-      const sl = search.toLowerCase();
-      filteredNodes = filteredNodes.filter((n) =>
-        n.canonical_name.toLowerCase().includes(sl) || n.entity_id.toLowerCase().includes(sl),
-      );
-    }
-    const allowed = new Set(filteredNodes.map((n) => n.id));
-    const filteredLinks = links.filter((l) => {
-      const s = typeof l.source === "object" ? (l.source as GraphNode).id : l.source;
-      const t = typeof l.target === "object" ? (l.target as GraphNode).id : l.target;
-      return allowed.has(s) && allowed.has(t);
-    });
-    return { nodes: filteredNodes, links: filteredLinks };
-  }, [nodes, links, selectedClasses, search]);
-
-  return (
-    <div className="relative w-full h-full bg-[#040810] overflow-hidden">
-      {/* LEFT sidebar — filters (sempre visível, fora do z-30 do page header) */}
-      <div className="absolute top-20 left-4 z-20 w-[240px] max-h-[calc(100vh-180px)] overflow-y-auto bg-[#0a121e]/95 backdrop-blur border border-[rgba(0,255,156,0.20)] rounded p-3 space-y-4">
-        <div>
-          <div className="font-mono text-[10px] uppercase tracking-widest text-[#5a6678] mb-2">
-            🔍 buscar nó
-          </div>
-          <input
-            value={search}
-            onChange={(e) => setSearch(e.target.value)}
-            placeholder="nome ou id..."
-            className="w-full bg-transparent border border-[rgba(0,255,156,0.20)] focus:border-[#00ff9c] rounded px-2 py-1.5 font-mono text-xs text-[#c8d4e6] outline-none"
-          />
-        </div>
-
-        <div>
-          <div className="font-mono text-[10px] uppercase tracking-widest text-[#5a6678] mb-2">
-            classes
-          </div>
-          <div className="space-y-1">
-            {ALL_CLASSES.map((cls) => {
-              const active = selectedClasses.has(cls);
-              const color = CLASS_COLOR[cls] ?? "#7fdbff";
-              return (
-                <button
-                  key={cls}
-                  onClick={() => toggleClass(cls)}
-                  className={`w-full flex items-center gap-2 px-2 py-1 font-mono text-[11px] rounded border transition ${
-                    active ? "" : "opacity-30 hover:opacity-60"
-                  }`}
-                  style={{
-                    color,
-                    borderColor: color,
-                    background: active ? `${color}12` : "transparent",
-                  }}
-                >
-                  <span className="inline-block w-2 h-2 rounded-full" style={{ background: color }} />
-                  <span className="flex-1 text-left">{CLASS_LABEL[cls]}</span>
-                  {active && <span>✓</span>}
-                </button>
-              );
-            })}
-          </div>
-        </div>
-
-        <div>
-          <div className="font-mono text-[10px] uppercase tracking-widest text-[#5a6678] mb-2">
-            top entidades
-          </div>
-          <div className="flex flex-wrap gap-1">
-            {[20, 40, 80, 150].map((n) => (
-              <button
-                key={n}
-                onClick={() => setLimit(n)}
-                className={`px-2 py-1 font-mono text-[11px] rounded border ${
-                  limit === n
-                    ? "border-[#00ff9c] text-[#00ff9c] bg-[rgba(0,255,156,0.10)]"
-                    : "border-[rgba(127,219,255,0.20)] text-[#8896aa] hover:text-[#7fdbff]"
-                }`}
-              >
-                {n}
-              </button>
-            ))}
-          </div>
-        </div>
-
-        <div>
-          <div className="font-mono text-[10px] uppercase tracking-widest text-[#5a6678] mb-2">
-            mostrar vínculos com ≥
-          </div>
-          <div className="flex flex-wrap gap-1">
-            {[2, 3, 5, 10].map((n) => (
-              <button
-                key={n}
-                onClick={() => setMinWeight(n)}
-                className={`px-2 py-1 font-mono text-[11px] rounded border ${
-                  minWeight === n
-                    ? "border-[#00ff9c] text-[#00ff9c] bg-[rgba(0,255,156,0.10)]"
-                    : "border-[rgba(127,219,255,0.20)] text-[#8896aa] hover:text-[#7fdbff]"
-                }`}
-              >
-                {n}×
-              </button>
-            ))}
-          </div>
-        </div>
-
-        <div>
-          <div className="font-mono text-[10px] uppercase tracking-widest text-[#5a6678] mb-2">
-            força do vínculo
-          </div>
-          <div className="space-y-1 text-[10px] font-mono">
-            <div className="flex items-center gap-2">
-              <span className="inline-block w-6 h-0.5" style={{ background: "rgba(0,255,156,0.55)" }} />
-              <span className="text-[#8896aa]">≥ 10 co-menções</span>
-            </div>
-            <div className="flex items-center gap-2">
-              <span className="inline-block w-6 h-0.5" style={{ background: "rgba(127,219,255,0.45)" }} />
-              <span className="text-[#8896aa]">5–9</span>
-            </div>
-            <div className="flex items-center gap-2">
-              <span className="inline-block w-6 h-0.5" style={{ background: "rgba(167,139,250,0.35)" }} />
-              <span className="text-[#8896aa]">3–4</span>
-            </div>
-            <div className="flex items-center gap-2">
-              <span className="inline-block w-6 h-0.5" style={{ background: "rgba(127,219,255,0.18)" }} />
-              <span className="text-[#8896aa]">2 (mín.)</span>
-            </div>
-          </div>
-        </div>
-
-        <div className="pt-2 border-t border-[rgba(0,255,156,0.10)] font-mono text-[10px] text-[#5a6678]">
-          {loading ? "carregando…" : `${visibleData.nodes.length} nós · ${visibleData.links.length} arestas`}
-        </div>
-      </div>
-
-      {/* RIGHT side panel — entidade selecionada */}
-      {selectedNode && (
-        <div className="absolute top-20 right-4 z-20 w-[340px] max-h-[calc(100vh-180px)] overflow-y-auto bg-[#0a121e]/95 backdrop-blur border-2 rounded p-4 space-y-4"
-             style={{ borderColor: CLASS_COLOR[selectedNode.entity_class] ?? "#7fdbff" }}>
-          <div className="flex items-start justify-between gap-2">
-            <div className="flex-1 min-w-0">
-              <div
-                className="font-mono text-[10px] uppercase tracking-widest mb-1"
-                style={{ color: CLASS_COLOR[selectedNode.entity_class] ?? "#7fdbff" }}
-              >
-                {CLASS_LABEL[selectedNode.entity_class] ?? selectedNode.entity_class}
-              </div>
-              <h3 className="font-mono text-base text-[#c8d4e6] font-bold leading-tight break-words">
-                {selectedNode.canonical_name}
-              </h3>
-              <div className="font-mono text-[10px] text-[#5a6678] mt-1 truncate">
-                {selectedNode.entity_id}
-              </div>
-            </div>
-            <button
-              onClick={() => setSelectedNode(null)}
-              className="text-[#5a6678] hover:text-[#ff6b6b] flex-shrink-0"
-              aria-label="fechar"
-            >
-              ✕
-            </button>
-          </div>
-
-          <div className="grid grid-cols-2 gap-2">
-            <div className="px-3 py-2 bg-[#060a13] border border-[rgba(0,255,156,0.20)] rounded">
-              <div className="font-mono text-[9px] uppercase text-[#5a6678]">menções</div>
-              <div className="font-mono text-lg text-[#00ff9c] mt-0.5">{selectedNode.total_mentions}</div>
-            </div>
-            <div className="px-3 py-2 bg-[#060a13] border border-[rgba(127,219,255,0.20)] rounded">
-              <div className="font-mono text-[9px] uppercase text-[#5a6678]">documentos</div>
-              <div className="font-mono text-lg text-[#7fdbff] mt-0.5">{selectedNode.documents_count}</div>
-            </div>
-          </div>
-
-          {/* Action buttons */}
-          <div className="space-y-1.5">
-            <Link
-              href={`/e/${CLASS_FOLDER[selectedNode.entity_class]}/${selectedNode.entity_id}`}
-              className="block w-full px-3 py-2 font-mono text-xs uppercase tracking-widest border-2 border-[#00ff9c] text-[#00ff9c] bg-[rgba(0,255,156,0.08)] hover:bg-[rgba(0,255,156,0.18)] rounded text-center"
-            >
-              abrir página completa →
-            </Link>
-            <button
-              onClick={() => expandNode(selectedNode)}
-              className="block w-full px-3 py-2 font-mono text-xs uppercase tracking-widest border border-[#7fdbff] text-[#7fdbff] hover:bg-[rgba(127,219,255,0.10)] rounded"
-            >
-              + expandir vizinhos no grafo
-            </button>
-          </div>
-
-          {/* Neighbors list */}
-          <div>
-            <div className="font-mono text-[10px] uppercase tracking-widest text-[#5a6678] mb-2">
-              {detailLoading ? "carregando vizinhos…" : `top vínculos (${detail?.neighbors.length ?? 0})`}
-            </div>
-            {detail?.neighbors && detail.neighbors.length > 0 ? (
-              <ul className="space-y-1">
-                {detail.neighbors.map((n) => {
-                  const color = CLASS_COLOR[n.entity_class] ?? "#7fdbff";
-                  return (
-                    <li key={n.entity_pk}>
-                      <button
-                        onClick={() => {
-                          const folded = nodes.find((nn) => nn.entity_pk === n.entity_pk);
-                          if (folded) {
-                            setSelectedNode(folded);
-                          } else {
-                            // Inject into graph + select
-                            const newNode: GraphNode = {
-                              entity_pk: n.entity_pk,
-                              entity_class: n.entity_class,
-                              entity_id: n.entity_id,
-                              canonical_name: n.canonical_name,
-                              total_mentions: n.total_mentions,
-                              documents_count: 0,
-                              id: n.entity_pk,
-                            };
-                            setNodes((prev) => [...prev, newNode]);
-                            setLinks((prev) => [...prev, { source: selectedNode.entity_pk, target: n.entity_pk, weight: n.weight }]);
-                            setSelectedNode(newNode);
-                          }
-                        }}
-                        className="group w-full flex items-center gap-2 text-left p-1.5 -mx-1.5 rounded hover:bg-[rgba(0,255,156,0.04)]"
-                      >
-                        <span
-                          className="inline-block w-2 h-2 rounded-full flex-shrink-0"
-                          style={{ background: color }}
-                        />
-                        <span className="text-[11px] text-[#c8d4e6] group-hover:text-[#00ff9c] flex-1 truncate">
-                          {n.canonical_name}
-                        </span>
-                        <span className="font-mono text-[10px] text-[#5a6678] flex-shrink-0">×{n.weight}</span>
-                      </button>
-                    </li>
-                  );
-                })}
-              </ul>
-            ) : !detailLoading ? (
-              <p className="font-mono text-[10px] text-[#5a6678] italic">sem co-menções</p>
-            ) : null}
-          </div>
-
-          <p className="font-mono text-[9px] text-[#5a6678] pt-2 border-t border-[rgba(0,255,156,0.10)]">
-            duplo-clique no nó: abre página da entidade · clique vizinho: foca nele
-          </p>
-        </div>
-      )}
-
-      {/* Hover tooltip — segue o mouse */}
-      {hoverNode && hoverPos && (
-        <div
-          className="absolute z-30 pointer-events-none px-2.5 py-1.5 bg-[#0a121e] border-2 rounded text-xs font-mono"
-          style={{
-            left: hoverPos.x + 12,
-            top: hoverPos.y + 12,
-            borderColor: CLASS_COLOR[hoverNode.entity_class] ?? "#7fdbff",
-          }}
-        >
-          <div className="text-[#c8d4e6] font-bold">{hoverNode.canonical_name}</div>
-          <div className="text-[10px] text-[#5a6678]">
-            {hoverNode.entity_class} · {hoverNode.total_mentions} menções · {hoverNode.documents_count} docs
-          </div>
-          <div className="text-[9px] text-[#7fdbff] mt-0.5">clique para detalhes</div>
-        </div>
-      )}
-
-      {/* Canvas */}
-      <ForceGraph2D
-        ref={fgRef as never}
-        graphData={visibleData as never}
-        backgroundColor="#040810"
-        nodeRelSize={2.5}
-        nodeVal={(n) => Math.max(1.5, Math.log2((n as GraphNode).total_mentions + 2) * 0.8)}
-        nodeColor={(n) => CLASS_COLOR[(n as GraphNode).entity_class] ?? "#7fdbff"}
-        nodeLabel={() => ""}
-        linkColor={(l) => edgeColor((l as GraphLink).weight)}
-        linkWidth={(l) => edgeWidth((l as GraphLink).weight)}
-        // Physics — separa nós com força + arestas mais longas
-        d3VelocityDecay={0.3}
-        d3AlphaDecay={0.015}
-        cooldownTicks={250}
-        warmupTicks={60}
-        // Use d3-force charge customization via dagMode? No, lib has limited API; rely on defaults + manual.
-        onNodeClick={onNodeClick as never}
-        onNodeHover={(n) => {
-          setHoverNode(n as GraphNode | null);
-          if (!n) setHoverPos(null);
-        }}
-        onBackgroundClick={() => setSelectedNode(null)}
-        nodeCanvasObjectMode={() => "after"}
-        nodeCanvasObject={(n, ctx, scale) => {
-          const node = n as GraphNode;
-          const isSelected = selectedNode?.entity_pk === node.entity_pk;
-          const isHovered = hoverNode?.entity_pk === node.entity_pk;
-          // Anti-clutter: with many nodes, mostrar label só:
-          //   - quando zoomado (scale ≥ 1.5)
-          //   - OU é hub (>200 mentions)
-          //   - OU é hover/selected
-          const isHub = node.total_mentions >= 200;
-          const showLabel = isSelected || isHovered || isHub || scale >= 1.5;
-          if (!showLabel) {
-            if (isSelected) {
-              ctx.beginPath();
-              ctx.arc(node.x ?? 0, node.y ?? 0, 10 / scale, 0, 2 * Math.PI, false);
-              ctx.strokeStyle = "#00ff9c";
-              ctx.lineWidth = 2.5 / scale;
-              ctx.stroke();
-            }
-            return;
-          }
-          const fontSize = Math.max(10, 14 / scale);
-          ctx.font = `${isHub ? "bold " : ""}${fontSize}px sans-serif`;
-          const label =
-            node.canonical_name.length > 28
-              ? node.canonical_name.slice(0, 26) + "…"
-              : node.canonical_name;
-          const tw = ctx.measureText(label).width;
-          const pad = 4 / scale;
-          // Background pill behind text — readability
-          ctx.fillStyle = isSelected ? "rgba(0,255,156,0.85)" : "rgba(10,18,30,0.85)";
-          ctx.fillRect(
-            (node.x ?? 0) - tw / 2 - pad,
-            (node.y ?? 0) + 8 / scale,
-            tw + pad * 2,
-            fontSize + pad,
-          );
-          ctx.fillStyle = isSelected ? "#040810" : "#c8d4e6";
-          ctx.textAlign = "center";
-          ctx.textBaseline = "top";
-          ctx.fillText(label, node.x ?? 0, (node.y ?? 0) + 8 / scale + pad / 2);
-          // Selected ring
-          if (isSelected) {
-            ctx.beginPath();
-            ctx.arc(node.x ?? 0, node.y ?? 0, 10 / scale, 0, 2 * Math.PI, false);
-            ctx.strokeStyle = "#00ff9c";
-            ctx.lineWidth = 2.5 / scale;
-            ctx.stroke();
-          }
-        }}
-      />
-    </div>
-  );
-}
diff --git a/web/lib/chat/tools.ts b/web/lib/chat/tools.ts
index 96439eb..89e9083 100644
--- a/web/lib/chat/tools.ts
+++ b/web/lib/chat/tools.ts
@@ -314,6 +314,39 @@ const co_mention_chunks_tool: ToolDefinition = {
   },
 };
 
+const analyze_image_region_tool: ToolDefinition = {
+  type: "function",
+  function: {
+    name: "analyze_image_region",
+    description:
+      "Vision tool — answer a question about a cropped region of a document page. " +
+      "Use this when the user asks about a photograph, diagram, sketch, signature, " +
+      "stamp, redaction, or any visual element where the chunk's text description " +
+      "isn't enough. The model reads the actual pixels via Sonnet vision. " +
+      "Get the bbox + page from a prior hybrid_search hit (each chunk carries bbox). " +
+      "Cost: ~$0.005–$0.02 per call. Use sparingly; prefer hybrid_search first.",
+    parameters: {
+      type: "object",
+      properties: {
+        doc_id: { type: "string" },
+        page: { type: "integer", description: "1-indexed page number" },
+        bbox: {
+          type: "object",
+          description: "Normalized bbox (0..1) of the region to analyze.",
+          properties: {
+            x: { type: "number" }, y: { type: "number" },
+            w: { type: "number" }, h: { type: "number" },
+          },
+          required: ["x", "y", "w", "h"],
+        },
+        question: { type: "string", description: "What you want to know about the image." },
+        context: { type: "string", description: "Optional: prose context that grounds the model." },
+      },
+      required: ["doc_id", "page", "bbox", "question"],
+    },
+  },
+};
+
 const navigate_to_tool: ToolDefinition = {
   type: "function",
   function: {
@@ -345,6 +378,7 @@ export const TOOL_DEFINITIONS: ToolDefinition[] = [
   read_document_tool,
   read_entity_tool,
   search_corpus_tool,
+  analyze_image_region_tool,
   navigate_to_tool,
 ];
 
@@ -398,6 +432,11 @@ async function handleHybridSearch(
       classification: (args.classification as string) || null,
       ufo_only: Boolean(args.ufo_only),
       top_k,
+      // W2-TD#8: chat is latency-sensitive — skip rerank when ≤10 candidates.
+      // The model only cites the first few hits anyway and BGE-Reranker
+      // adds 5-8s on CPU. RRF order from the RPC is plenty for the head.
+      rerank_strategy: "when_top_k_gt",
+      rerank_threshold: 10,
     });
     // Emit one citation (+ optional crop_image) artifact per hit so the UI can
     // render inline cards next to the assistant text. Limit to top 6 to avoid
@@ -684,6 +723,37 @@ async function handleNavigate(args: Record<string, unknown>): Promise<unknown> {
   return { ok: true, target, label };
 }
 
+async function handleAnalyzeImageRegion(
+  args: Record<string, unknown>,
+  ctx: ToolHandlerContext,
+): Promise<unknown> {
+  const doc_id = String(args.doc_id ?? "").trim();
+  const page = Number(args.page);
+  const bbox = args.bbox as { x: number; y: number; w: number; h: number } | undefined;
+  const question = String(args.question ?? "").trim();
+  if (!doc_id || !page || !bbox || !question) return { error: "missing_args" };
+  try {
+    const { analyzeImageRegion } = await import("./vision");
+    const out = await analyzeImageRegion({
+      doc_id, page, bbox, question,
+      context: typeof args.context === "string" ? args.context : undefined,
+      lang: ctx.lang === "en" ? "en" : "pt",
+    });
+    if (ctx.emitArtifact) {
+      ctx.emitArtifact({
+        kind: "crop_image",
+        src: out.crop_url,
+        doc_id, page,
+        alt_en: question.slice(0, 120),
+        alt_pt: question.slice(0, 120),
+      });
+    }
+    return out;
+  } catch (e) {
+    return { error: "vision_failed", message: (e as Error).message };
+  }
+}
+
 export const TOOL_HANDLERS: Record<string, ToolHandler> = {
   hybrid_search: handleHybridSearch,
   read_chunk: handleReadChunk,
@@ -696,5 +766,6 @@ export const TOOL_HANDLERS: Record<string, ToolHandler> = {
   read_document: handleReadDocument,
   read_entity: handleReadEntity,
   search_corpus: handleSearch,
+  analyze_image_region: handleAnalyzeImageRegion,
   navigate_to: handleNavigate,
 };
diff --git a/web/lib/chat/vision.ts b/web/lib/chat/vision.ts
new file mode 100644
index 0000000..12c84eb
--- /dev/null
+++ b/web/lib/chat/vision.ts
@@ -0,0 +1,165 @@
+/**
+ * vision.ts — answer questions about an image region via Claude Code OAuth.
+ *
+ * Pattern matches the project's existing vision pipeline (02-vision-page.py):
+ *   1. Crop the PNG of the requested page to the requested bbox.
+ *   2. Spawn `claude -p --model sonnet --allowedTools Read` and instruct the
+ *      model to Read the local PNG path and answer the user's question.
+ *
+ * Uses the user's Claude Code OAuth (Max 20x). Per W1.2 budget policy, the
+ * agentic worker may use Opus 4.7 without hard cap, but `analyze_image_region`
+ * runs synchronously in the chat path — keep it on Sonnet for latency.
+ */
+import { spawn } from "node:child_process";
+import { mkdtemp, unlink, rmdir } from "node:fs/promises";
+import path from "node:path";
+import os from "node:os";
+import sharp from "sharp";
+import { PROCESSING } from "@/lib/wiki";
+
+const MODEL = process.env.VISION_MODEL || "sonnet";
+const TIMEOUT_MS = Number(process.env.VISION_TIMEOUT_MS || 120_000);
+
+export interface AnalyzeImageRegionArgs {
+  doc_id: string;
+  page: number;
+  bbox: { x: number; y: number; w: number; h: number };
+  question: string;
+  /** Optional context to ground the model (e.g., "this is an FBI memo from 1947"). */
+  context?: string;
+  /** Output language hint. Defaults to "pt-br". */
+  lang?: "pt" | "en";
+}
+
+export interface AnalyzeImageRegionResult {
+  answer: string;
+  model: string;
+  duration_ms: number;
+  bbox: { x: number; y: number; w: number; h: number };
+  crop_url: string;
+}
+
+function pageFilename(page: number): string {
+  return `p-${String(page).padStart(3, "0")}.png`;
+}
+
+/** Crop a bbox region of a page PNG and write the result to a temp file. */
+async function cropToTempFile(args: AnalyzeImageRegionArgs): Promise<{ path: string; dir: string }> {
+  const sourcePath = path.join(PROCESSING, "png", args.doc_id, pageFilename(args.page));
+  const meta = await sharp(sourcePath).metadata();
+  const W = meta.width ?? 0;
+  const H = meta.height ?? 0;
+  if (W === 0 || H === 0) throw new Error(`source PNG unreadable: ${sourcePath}`);
+  const left = Math.max(0, Math.round(args.bbox.x * W));
+  const top = Math.max(0, Math.round(args.bbox.y * H));
+  const width = Math.max(1, Math.min(W - left, Math.round(args.bbox.w * W)));
+  const height = Math.max(1, Math.min(H - top, Math.round(args.bbox.h * H)));
+
+  const dir = await mkdtemp(path.join(os.tmpdir(), "analyze-image-"));
+  const filePath = path.join(dir, "crop.png");
+  await sharp(sourcePath)
+    .extract({ left, top, width, height })
+    .resize({ width: Math.min(1024, width), withoutEnlargement: true })
+    .png()
+    .toFile(filePath);
+  return { path: filePath, dir };
+}
+
+function buildPrompt(args: AnalyzeImageRegionArgs, cropPath: string): string {
+  const lang = args.lang === "en" ? "English" : "Brazilian Portuguese (pt-br)";
+  const ctx = args.context ? `\n\nContext: ${args.context}` : "";
+  return [
+    `Use the Read tool on this local PNG file: ${cropPath}`,
+    "",
+    `The image is a cropped region from document "${args.doc_id}", page ${args.page}.`,
+    ctx,
+    "",
+    `Answer this question about what is visible in the image, in ${lang}:`,
+    "",
+    args.question,
+    "",
+    "Rules:",
+    "- Be factual and concise (3-8 sentences unless the question requires more).",
+    "- If text is visible, transcribe the relevant portion verbatim (do not translate).",
+    "- If the image is unclear or empty, say so explicitly. Don't invent.",
+    "- Do not call any tool besides Read on the provided path.",
+  ].join("\n");
+}
+
+/** Spawn `claude -p` and return the JSON output result. */
+function callClaudeCli(prompt: string): Promise<{ result: string; durationMs: number; costUsd?: number; tokensIn?: number; tokensOut?: number }> {
+  return new Promise((resolve, reject) => {
+    const t0 = Date.now();
+    const child = spawn(
+      "claude",
+      [
+        "-p",
+        "--model", MODEL,
+        "--output-format", "json",
+        "--max-turns", "2",
+        "--allowedTools", "Read",
+        "--",
+        prompt,
+      ],
+      { stdio: ["ignore", "pipe", "pipe"], env: { ...process.env } },
+    );
+    let stdout = "";
+    let stderr = "";
+    child.stdout.on("data", (c) => (stdout += c.toString()));
+    child.stderr.on("data", (c) => (stderr += c.toString()));
+    const t = setTimeout(() => {
+      child.kill("SIGKILL");
+      reject(new Error(`claude CLI timeout > ${TIMEOUT_MS}ms`));
+    }, TIMEOUT_MS);
+    child.on("error", (e) => { clearTimeout(t); reject(e); });
+    child.on("close", (code) => {
+      clearTimeout(t);
+      if (code !== 0) {
+        return reject(new Error(`claude CLI rc=${code}: ${stderr.slice(-300)}`));
+      }
+      try {
+        const cli = JSON.parse(stdout);
+        if (cli.is_error) return reject(new Error(`claude error: ${(cli.result || "").slice(0, 300)}`));
+        resolve({
+          result: cli.result || "",
+          durationMs: cli.duration_ms || Date.now() - t0,
+          costUsd: cli.total_cost_usd,
+          tokensIn: cli.usage?.input_tokens,
+          tokensOut: cli.usage?.output_tokens,
+        });
+      } catch (e) {
+        reject(new Error(`claude stdout parse: ${e instanceof Error ? e.message : String(e)}`));
+      }
+    });
+  });
+}
+
+export async function analyzeImageRegion(args: AnalyzeImageRegionArgs): Promise<AnalyzeImageRegionResult> {
+  if (!args.doc_id) throw new Error("doc_id required");
+  if (!Number.isFinite(args.page) || args.page < 1) throw new Error("page must be >= 1");
+  if (!args.bbox || !["x", "y", "w", "h"].every((k) => Number.isFinite((args.bbox as Record<string, unknown>)[k]))) {
+    throw new Error("bbox {x,y,w,h} required (normalized 0..1)");
+  }
+  if (!args.question?.trim()) throw new Error("question required");
+
+  const { path: cropPath, dir } = await cropToTempFile(args);
+  try {
+    const t0 = Date.now();
+    const prompt = buildPrompt(args, cropPath);
+    const out = await callClaudeCli(prompt);
+    const cropUrl =
+      `/api/crop?doc=${encodeURIComponent(args.doc_id)}` +
+      `&page=${args.page}&x=${args.bbox.x}&y=${args.bbox.y}&w=${args.bbox.w}&h=${args.bbox.h}&w_px=640`;
+    return {
+      answer: out.result.trim(),
+      model: MODEL,
+      duration_ms: out.durationMs || Date.now() - t0,
+      bbox: args.bbox,
+      crop_url: cropUrl,
+    };
+  } finally {
+    // Best-effort cleanup. Crop is in $TMPDIR, OS will reap if we miss.
+    unlink(cropPath).catch(() => undefined);
+    rmdir(dir).catch(() => undefined);
+  }
+}
diff --git a/web/lib/retrieval/hybrid.ts b/web/lib/retrieval/hybrid.ts
index 5474409..3836ed4 100644
--- a/web/lib/retrieval/hybrid.ts
+++ b/web/lib/retrieval/hybrid.ts
@@ -43,8 +43,24 @@ export interface HybridSearchOptions {
   recall_k?: number;
   /** Final list size after rerank (default 20). */
   top_k?: number;
-  /** Skip reranker (faster, lower precision). */
+  /** Skip reranker (faster, lower precision). Back-compat shortcut for
+   *  `rerank_strategy: "never"`. */
   no_rerank?: boolean;
+  /**
+   * W2-TD#8: rerank policy.
+   *   - "always"        — always run the cross-encoder (highest precision,
+   *                       slowest, 5–8s on CPU)
+   *   - "when_top_k_gt" — rerank only when `top_k > rerank_threshold`
+   *                       (default threshold 15). RRF order from the RPC is
+   *                       usually good enough for the tight head of results;
+   *                       the reranker pays off when re-sorting a wider list.
+   *                       This is the new default — autocomplete / chat
+   *                       top-10 calls now skip rerank for free.
+   *   - "never"         — same as `no_rerank: true`.
+   */
+  rerank_strategy?: "always" | "when_top_k_gt" | "never";
+  /** Threshold for `when_top_k_gt`. Default 15 (per ADR-001). */
+  rerank_threshold?: number;
 }
 
 export async function hybridSearch(opts: HybridSearchOptions): Promise<ChunkHit[]> {
@@ -58,8 +74,14 @@ export async function hybridSearch(opts: HybridSearchOptions): Promise<ChunkHit[
     recall_k = 100,
     top_k = 20,
     no_rerank = false,
+    rerank_strategy = "when_top_k_gt",
+    rerank_threshold = 15,
   } = opts;
 
+  // Effective strategy: explicit `no_rerank=true` always wins (back-compat).
+  const strategy: "always" | "when_top_k_gt" | "never" =
+    no_rerank ? "never" : rerank_strategy;
+
   if (!query.trim()) return [];
 
   // 1. Embed the query
@@ -89,9 +111,13 @@ export async function hybridSearch(opts: HybridSearchOptions): Promise<ChunkHit[
   if (rows.length === 0) return [];
 
   // 3. Optional cross-encoder rerank for finer ordering. It's CPU-slow
-  // (seconds per ~dozen candidates), so it's opt-in (rerank=1); the default
-  // fast path trusts the RPC's RRF order over the already-gated candidates.
-  if (no_rerank) {
+  // (seconds per ~dozen candidates). Strategy resolution (W2-TD#8 / ADR-001):
+  //   - "never"         → skip
+  //   - "when_top_k_gt" → skip when top_k ≤ threshold (RRF is good enough
+  //                       for a small head)
+  //   - "always"        → run unconditionally
+  if (strategy === "never" ||
+      (strategy === "when_top_k_gt" && top_k <= rerank_threshold)) {
     return rows.slice(0, top_k);
   }
 
diff --git a/web/package-lock.json b/web/package-lock.json
index edf7a92..34cff37 100644
--- a/web/package-lock.json
+++ b/web/package-lock.json
@@ -26,7 +26,6 @@
         "pino": "^10.3.1",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
-        "react-force-graph-2d": "^1.27.0",
         "react-markdown": "^9.0.0",
         "remark-gfm": "^4.0.0",
         "remark-wiki-link": "^2.0.1",
@@ -5993,12 +5992,6 @@
         "tslib": "^2.8.0"
       }
     },
-    "node_modules/@tweenjs/tween.js": {
-      "version": "25.0.0",
-      "resolved": "https://registry.npmjs.org/@tweenjs/tween.js/-/tween.js-25.0.0.tgz",
-      "integrity": "sha512-XKLA6syeBUaPzx4j3qwMqzzq+V4uo72BnlbOjmuljLrRqdsd3qnzvZZoxvMHZ23ndsRS4aufU6JOZYpCbU6T1A==",
-      "license": "MIT"
-    },
     "node_modules/@types/connect": {
       "version": "3.4.38",
       "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.38.tgz",
@@ -6135,15 +6128,6 @@
       "integrity": "sha512-mUFwbeTqrVgDQxFveS+df2yfap6iuP20NAKAsBt5jDEoOTDew+zwLAOilHCeQJOVSvmgCX4ogqIrA0mnyr08yQ==",
       "license": "ISC"
     },
-    "node_modules/accessor-fn": {
-      "version": "1.5.3",
-      "resolved": "https://registry.npmjs.org/accessor-fn/-/accessor-fn-1.5.3.tgz",
-      "integrity": "sha512-rkAofCwe/FvYFUlMB0v0gWmhqtfAtV1IUkdPbfhTUyYniu5LrC0A0UJkTH0Jv3S8SvwkmfuAlY+mQIJATdocMA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=12"
-      }
-    },
     "node_modules/acorn": {
       "version": "8.16.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.16.0.tgz",
@@ -6335,16 +6319,6 @@
         "node": ">=6.0.0"
       }
     },
-    "node_modules/bezier-js": {
-      "version": "6.1.4",
-      "resolved": "https://registry.npmjs.org/bezier-js/-/bezier-js-6.1.4.tgz",
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-      "license": "MIT",
-      "dependencies": {
-        "force-graph": "^1.51",
-        "prop-types": "15",
-        "react-kapsule": "^2.5"
-      },
-      "engines": {
-        "node": ">=12"
-      },
-      "peerDependencies": {
-        "react": "*"
-      }
-    },
-    "node_modules/react-is": {
-      "version": "16.13.1",
-      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",
-      "integrity": "sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==",
-      "license": "MIT"
-    },
-    "node_modules/react-kapsule": {
-      "version": "2.5.7",
-      "resolved": "https://registry.npmjs.org/react-kapsule/-/react-kapsule-2.5.7.tgz",
-      "integrity": "sha512-kifAF4ZPD77qZKc4CKLmozq6GY1sBzPEJTIJb0wWFK6HsePJatK3jXplZn2eeAt3x67CDozgi7/rO8fNQ/AL7A==",
-      "license": "MIT",
-      "dependencies": {
-        "jerrypick": "^1.1.1"
-      },
-      "engines": {
-        "node": ">=12"
-      },
-      "peerDependencies": {
-        "react": ">=16.13.1"
-      }
-    },
     "node_modules/react-markdown": {
       "version": "9.1.0",
       "resolved": "https://registry.npmjs.org/react-markdown/-/react-markdown-9.1.0.tgz",
@@ -10991,12 +10582,6 @@
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       "license": "MIT"
     },
-    "node_modules/tinycolor2": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/tinycolor2/-/tinycolor2-1.6.0.tgz",
-      "integrity": "sha512-XPaBkWQJdsf3pLKJV9p4qN/S+fm2Oj8AIPo1BTUhg5oxkvm9+SVEGFdhyOz7tTdUTfvxMiAs4sp6/eZO2Ew+pw==",
-      "license": "MIT"
-    },
     "node_modules/tinyglobby": {
       "version": "0.2.16",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.16.tgz",
diff --git a/web/package.json b/web/package.json
index 0f5112d..633d2db 100644
--- a/web/package.json
+++ b/web/package.json
@@ -28,7 +28,6 @@
     "pino": "^10.3.1",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
-    "react-force-graph-2d": "^1.27.0",
     "react-markdown": "^9.0.0",
     "remark-gfm": "^4.0.0",
     "remark-wiki-link": "^2.0.1",