docs(ai): refresh handoff state for next-session pickup under 200k context

Default Claude Code model is being switched from Opus 4.7 1M-context to
Opus 4.7 (200k). Tighten the per-session pickup docs so they're
self-sufficient under the smaller window:

- CURRENT_TASK now reflects the post-Codex state: 8 commits on the
  branch (5 feat + WIP SSE + 2 Codex test/latency fixes + 1 doc
  refresh), 32/32 backend tests with -n auto, frontend tsc -b clean.
  Remaining work re-scoped: the SSE backend half is feature-complete
  and tested, so what's left is the FRONTEND SSE subscription in
  EscalationQueue.tsx, then the magic-moment handoff-context screen,
  then push + draft PR.
- Session log gets a Claude Code entry covering today's planning →
  build → pause-for-Codex arc, the design decisions locked into the
  doc and code, the two TODOs added (peer-tech escalation, mobile
  responsive), and the model-switch context for the next session.
- HANDOFF.md needs no change — Codex's update in 9bdd995 already
  describes the resume point and watch-outs cleanly.

No code change.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.ai/SESSION_LOG.md

@@ -12,6 +12,18 @@
 
 ---
 
+## 2026-04-27 EDT — Claude Code — Escalation Mode wedge: design through SSE backend (8 commits)
+
+- One long session that produced the entire planning artifact stack and most of the backend for the Escalation Mode wedge. Output of `/office-hours` (8 founder-signal session, top-tier YC archetype indicators), `/plan-eng-review` (scope reduced from "2-3 weeks greenfield" to "~6-9 days integration + metric + polish" once the existing handoff_manager surface was inventoried), `/plan-design-review` (6/10 → 9/10 with magic-moment screen, hero metric placement, and real-time arrival visual locked), and `/codex review` (12 findings, 6 applied — two-metric framing, notification routing, claim auth gate moved in-scope, unread-state fix, "Start here" CTA reframe, per-channel delivery model; 5 rejected including the full-scope reduction Codex pushed for).
+- Branched `feat/escalation-metric-endpoint` off `main` @ `c0ed6d9`. Stack at session end: `d51e95c` plan + test-plan artifacts; `52f6d03` `GET /analytics/flowpilot/escalations` endpoint with 9 tests including multi-tenant isolation; `7a5b853` claim-endpoint role gate; `07d0db9` email dispatch on escalate with graceful-degradation regression; `9f0bfd4` `EscalationMetricCard` mounted above the queue list; `a283d0d` mid-flight `.ai/` refresh; `87bd0b7` WIP commit for SSE pub/sub bus + endpoint + 7 bus unit tests + 1 dispatcher integration test + 2 endpoint tests; `ba46fc5` paused-for-Codex-review handoff. Codex picked up from `ba46fc5` and added `bc15952` / `fff8338` / `9bdd995` (test stabilization + assessment latency bound).
+- Pause was forced by a runaway local test loop: multiple stale `pytest` processes were left inside `resolutionflow_backend` after several aborted runs and contended on the same Postgres test schema. Codex diagnosed and fixed (see entry above).
+- Frontend: thin slice — added `getEscalationMetrics` to `flowpilotAnalyticsApi`, the `EscalationMetricCard` component (loading / error / zero-data states + avg + median + conversion-rate + the inline two-metric disclaimer), and mounted it above `EscalationQueue`. `tsc -b` clean.
+- Plan-stage UI decisions locked into the design doc and the codebase: dedicated 4-section magic-moment screen on Pick Up that dissolves into FlowPilot; queue stat-card + dedicated owner analytics page for the hero metric (in two places, not one); 200ms slide-in + tab-title flash on real-time arrival, no sound, respects `prefers-reduced-motion`; unread dot clears on open/claim/dismiss, NOT on hover (Codex correction). Claim role gate moved in-scope per Codex (not deferred to TODO).
+- Two TODOs added: peer-tech escalation (deferred to v2 once a pilot asks); mobile/responsive design (also v2; pre-PMF wedge demo targets desktop). Claim role gate's TODO entry was struck through in the same session because it shipped in `7a5b853`.
+- Plan and test-plan artifacts copied into `docs/plans/` under the `YYYY-MM-DD-name-design.md` / `-test-plan.md` convention so they live alongside the existing project plans, not just in `~/.gstack/projects/`.
+- Left for next session: frontend SSE subscription in `EscalationQueue.tsx` (fetch-based ReadableStream — native EventSource can't send auth headers; match `streamDocumentation` in `frontend/src/api/aiSessions.ts`), then the magic-moment handoff-context screen, then push + draft PR. Default Claude Code model is being switched from Opus 4.7 1M-context to Opus 4.7 (200k) for the next session — the resume docs are sized to be self-sufficient under the smaller window.
+- Files touched (committed): `docs/plans/2026-04-27-escalation-mode-wedge-design.md`, `docs/plans/2026-04-27-escalation-mode-wedge-test-plan.md`, `backend/app/api/endpoints/flowpilot_analytics.py`, `backend/app/schemas/flowpilot_analytics.py`, `backend/app/api/endpoints/session_handoffs.py`, `backend/app/services/handoff_manager.py`, `backend/app/core/escalation_bus.py` (new), `backend/tests/test_flowpilot_analytics_escalations.py` (new), `backend/tests/test_escalation_bus.py` (new), `backend/tests/test_handoff_manager.py`, `backend/tests/test_session_handoffs_api.py`, `frontend/src/types/flowpilot-analytics.ts`, `frontend/src/api/flowpilotAnalytics.ts`, `frontend/src/components/flowpilot/EscalationMetricCard.tsx` (new), `frontend/src/components/flowpilot/index.ts`, `frontend/src/pages/EscalationQueuePage.tsx`, `.ai/CURRENT_TASK.md`, `.ai/HANDOFF.md`, `.ai/TODO.md`.
+
 ## 2026-04-27 19:50 EDT — Codex — Stabilize Escalation Mode SSE backend tests
 
 - Diagnosed slow backend tests on `feat/escalation-metric-endpoint`. Multiple stale pytest processes were still alive inside `resolutionflow_backend` and held `resolutionflow_test` transactions open, blocking later per-test schema resets on `DROP SCHEMA public CASCADE`.