feat(readmymind): phase 3 PR 1: alternates, rethink steering, phone surfaces

- Alternate suggestions render as tappable rows that swap into the
  editable field, with their rationale as a visible second line (phones
  have no hover for a title tip). The predictor already returned up to 3
  kind-diverse suggestions; the modal showed only the first.
- Rethink now records every displayed suggestion as rejected and carries
  an optional free-text steer note (the API accepted steer since phase 2;
  the UI never collected it). Both reset on each open. The steer field
  stays available in the error phase: steering a failed run's retry is
  exactly when a note helps.
- The modal header names the target session: overview rows and the
  accessory key can open it for a session that is not the active tab.
- Phone surfaces: a keyboard-accessory 🧠 key (hidden unless
  readMyMindEnabled is ON and the active session is claude mode,
  re-derived after innerHTML rebuilds, settings applies, and session
  switches) and a Suggest strip on the phone overview's yellow waiting
  rows (waiting only: on red rows a dialog is on screen and input text
  would land in its menu; answer routing is phase 3 PR 2)
- The modal renders as a compact sheet on phones with 16px inputs (iOS
  zoom guard) and 44px tap targets
- Send/Insert/Rethink freeze during the loading phase so a stale
  suggestion cannot be sent mid-rethink
- test/readmymind-phase3-surfaces.test.ts pins the load-bearing facts in
  CI: key in BOTH bar layouts, [hidden] re-assertion over inline-flex,
  header button off phones, the waiting-only row gate, no terminal
  refocus from the readmymind action, steer outside the result div

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/readmymind-plan.md

@@ -122,14 +122,15 @@ Agent use cases this unlocks: a lead session records intentions as the user stat
 
 ## Phases
 
-1. **Intent store + capture + intent endpoints + skill docs.** Immediately useful to agents even before any UI exists.
-2. **Context assembler + predictor + predict endpoint + desktop button/modal.** The feature as pitched. The assembler ships with all collectors it can serve from day one (transcript, intent, git, run-summary, siblings); the approvals collector activates when PR #245 lands.
-3. **Phone accessory key, rethink steering, alternates row.**
-4. Explicitly later: proactive predict-on-idle (ghost suggestion chip), auto-compaction of `recentPrompts` into `goals` via a cheap model, codex/gemini capture, cross-case "global" intent.
+1. **Intent store + capture + intent endpoints + skill docs.** Immediately useful to agents even before any UI exists. Shipped 1.16.1 (PR #253).
+2. **Context assembler + predictor + predict endpoint + desktop button/modal.** The feature as pitched. The assembler ships with all collectors it can serve from day one (transcript, intent, git, run-summary, siblings); the approvals collector activates when PR #245 lands. Shipped 1.16.2 (PR #256).
+3. **Phase 3, PR 1: alternates row, rethink steering, phone surfaces.** Alternate suggestions as tappable rows that swap into the field; Rethink records everything displayed as rejected and carries the optional steer note; keyboard-accessory 🧠 key (`refreshReadMyMind()`, re-derived after every innerHTML rebuild, settings apply, and session switch); `🧠 Suggest` strip on the phone overview's YELLOW waiting rows only. Red rows deliberately get no shortcut yet: a dialog is on screen there and text sent via `POST /input` would land in its menu.
+4. **Phase 3, PR 2: the approvals fusion** (the Cloudflare OS learnings tie-in, items 1-2 of `cloudflare-os-learnings-plan.md`). `GET /api/sessions/:id/recap`: a deterministic "what was done, simplified" catch-up (last assistant tail + recent tool one-liners + git state) reusing the phase-2 collectors verbatim; no model call, effectively an observation-ledger v0 whose data source can later swap to a real ledger. Surfaces: collapsible "What happened" on approval cards (lazy-fetched), recap in the modal's loading phase (read while opus thinks), 🧠 on approval cards and red overview rows. Answer-aware Send: the predictor output gains an optional `answer` option number (validated against the pending dialog's parsed options, dropped when invalid) and the modal routes dialog answers through `POST /api/approvals/:id/answer` (option digits / idle text), keeping `POST /input` only for dialog-free sessions.
+5. Explicitly later: proactive predict-on-idle (ghost suggestion chip), auto-compaction of `recentPrompts` into `goals` via a cheap model, codex/gemini capture, cross-case "global" intent, a model-written prose recap (deterministic-only in v1).
 
 ## Open questions
 
-- Should Rethink's rejected-suggestion memory persist across modal closes, or reset each open?
+- ~~Should Rethink's rejected-suggestion memory persist across modal closes, or reset each open?~~ Decided in phase 2 and kept: reset each open (a fresh open is a fresh question); the steer note resets with it.
 - Is a composer-adjacent placement (next to the toolbar Run controls) better than the header for discoverability?
 - Pending-dialog input (source #1) consumes the approvals-inbox store (PR #245, merged): the phase-2 collector reads pending items directly from `src/approval-inbox.ts`.