Comment-only. No source change, no behaviour change.
The note on `isInReviewMissingWorktreeSessionStartFailure` said:
> Optional rather than required because the other caller
(`extension.ts`) still asks BOTH questions with the literal.
**It doesn't.** All three production callers pass the resolved answer:
```
packages/cli/src/extension.ts:1927 retryReviewColumns.has(task.column)
packages/cli/src/commands/task.ts:1390 retryReviewColumns.has(task.column)
packages/dashboard/src/routes/register-task-workflow-routes.ts:2885 retryReviewColumns.has(task.column)
```
Left standing, that sentence tells the next reader an unconverted caller
exists — and "we keep the fallback because someone still needs it" is
exactly the justification that keeps an inert-conversion shape alive. It
is the specific failure this program has spent the day removing, in the
form of a comment rather than code.
## The parameter stays optional, for a reason that does not rot
I checked whether to make it **required** — the unwired-lane-parameter
guard's own failure message suggests exactly that ("make the parameter
required so the compiler finds the call sites") — and decided against
it, for measured reasons:
- **25 test call sites** use the optional form, several of them
*precisely* to pin the degraded mode (`cli-active-count-lanes.test.ts`
exercises the no-argument path on both a legacy and a renamed lane).
Requiring the parameter deletes that coverage.
- The enforcement it would buy already exists: `isReviewColumn` is in
the guard's vocabulary, so if any of those three callers stops passing
it, the build fails.
So the note now gives the durable reason instead of the expired one.
## How this surfaced
Not from the census — the count here is unchanged, and an *omitted
argument* is invisible to it anyway. It came from reading an audit note
that named a specific caller and checking the claim. Notes that assert
facts about other files decay silently; this one had.
## Verification
- `pnpm lint` — clean
- `tsc --noEmit` (`@fusion/engine`) — clean
- `restart-recovery-coordinator.test.ts` — 12 passed
- `cli-active-count-lanes.test.ts` — 10 passed
- unwired-lane guard — 9/9, no new entries
- SQL-literal gate — green
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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