docs(chat): point the unwired transcript options at the reason, not a closed issue

[chenmingwei23]

1. What is the problem?

Comments in website/src/pages/chat/transcriptRenderers.tsx and its test point readers at #3332, which is now closed as not-planned. Three option groups say "tracked in #3332" for why they have no pane consumer, and the drift guard's comment tells the next reader to retire it "when ChatPage consumes these entries directly" — the migration that issue proposed and that was rejected.

2. Why this issue matters to the user

No runtime effect; this is a maintenance trap. A reader chasing #3332 lands on a closed issue and learns nothing about why the option is unwired, and the guard's comment actively invites someone to delete a check that is now permanent — which would re-open the exact regression #3302 fixed (a pane silently falling behind the single-chat row set).

3. How our fix solves it

Replace the pointers with the reason, so nothing has to be chased:

• appInPanel / onOpenApp — repointed to Files are not openable from a split view pane: the dock is activeSlot-keyed but pane focus is not #3300, which is genuinely the same root cause (the dock is activeSlot-keyed while pane focus is not).
• activeNudgeLoopId / onOpenNudgeLoop and the continuable / interrupted / continuing / onContinue group — no issue invented for them; the comment now states the precondition inline (a pane's composer cannot reach the auto-nudge popover; selectContinuable / selectTurnInterrupted read the active slot, so a pane cannot ask whether ITS turn was interrupted).
• The drift guard's comment now says it is permanent, records that convergence was considered and rejected, and names the asymmetry that makes a guard sufficient: ChatPage owns the row policy, so drift can only degrade a downstream surface, never that one. If a row both sides draw ever diverges in component or props, the cheap answer is to strengthen this into a static comparison — not to migrate the healthy surface.

Comments only; no behaviour, no exported API, no test assertions changed.

4. What tests we did

tsc --noEmit 0 errors · eslint 0 errors · vitest src/test/transcriptRenderers.test.tsx 18/18 pass. No i18n gates needed — no strings and no JSX touched.

5. Any other suggestions on the work

The rejected direction is worth stating once here so it does not get re-proposed: converging the two row sets means editing a 7000-line surface that has no user-visible defect, and the failure mode it would prevent is one-directional and already guarded. Let a second real consumer of the rich row set drive convergence if one ever appears.

[github-actions]

GPT 5.6 Review — ✅ no blocking findings

GPT 5.6 completed its review of c9da5740ee89638d9484b37d9f6bd99e6d7a1f83 and found no blocking issues.

This comment is updated in place on each push.

Review details

No findings.
[GPT-REVIEWED] c9da574

False positive or not applicable? A repository writer can comment:
/ai-review override gpt c9da5740ee89638d9484b37d9f6bd99e6d7a1f83: <one-sentence reason>

[github-actions]

Opus 4.8 Review — ✅ no blocking findings

Reviewed c9da5740ee89638d9484b37d9f6bd99e6d7a1f83 — this comment is updated in place on each push.

Review details

No findings.

[OPUS-REVIEWED] c9da574

Verdict parsed from the review's SHA-scoped output markers for commit c9da5740ee89638d9484b37d9f6bd99e6d7a1f83.

False positive or not applicable? A repository writer can comment:
/ai-review override fable c9da5740ee89638d9484b37d9f6bd99e6d7a1f83: <one-sentence reason>

[github-actions]

UX Review (Fable 5) — ✅ PASS

Advisory UX-level review of c9da5740ee89638d9484b37d9f6bd99e6d7a1f83 — updated in place on each push; does not block merge.

UX-Verdict: PASS

Comments-only change — no user-facing strings, UI, states, or rendered pixels touched; nothing a user can experience differs.

[UX-REVIEWED] c9da574

[github-actions]

Design Review (Fable 5) — ✅ PASS

Advisory design-level review of c9da5740ee89638d9484b37d9f6bd99e6d7a1f83 — updated in place on each push; does not block merge.

Design-Verdict: PASS

Comment-only change that replaces dead pointers with inline rationale and pins the drift guard's permanence; proportionate, no behavior or contract touched.

[DESIGN-REVIEWED] c9da574

[bolichen97]

Tier 1 auto-approve: small-fix (2 files). Criteria: no conflict, no requested changes, no security surface, AI reviewers green. Category: small-fix — corrects transcript options reference from closed issue to actual reason.