## Census
| | column guards |
|---|---|
| before | **101** |
| after | **97** |
The single-guard long tail is **19 files**. This converts the four whose
legacy arm is unambiguously a fallback on an already-converted guard;
the other 15 are flagged below rather than guessed at.
## Two shapes
**`in-review-stall.ts`, `stalled-review-detector.ts`** — the resolved
answer with an inline legacy arm:
```ts
reviewColumns ? reviewColumns.has(col) : col === "in-review"
→ (reviewColumns ?? LEGACY_REVIEW_LANES).has(col)
```
**`merger.ts`, `in-process-runtime.ts`** — belt-and-braces:
```ts
col !== (lifecycle?.complete ?? "done") && col !== "done"
```
That accepted the resolved lane **or** the legacy id, stated twice. A
union set says it once, so the two halves can't drift apart — which is
the real risk with a duplicated condition.
## A finding for anyone else marking fallbacks
`in-review-stall.ts` **already carried a `DELIBERATE-LITERAL` marker**
on that arm and was counted anyway. The marker sits in a comment *inside
a ternary*, which the census's leading-comment lookup doesn't reach.
So: **naming the set works, marking it does not.** Worth knowing before
someone marks a fallback and expects the count to move.
## No behaviour change
`new Set(["in-review"]).has(x)` answers exactly what `x === "in-review"`
answered, and the union sets accept exactly the two lanes their
conditions already accepted.
## Flagged, not converted
The remaining 15 single-guard sites need individual judgement, not a
mechanical pass:
- **plain unconverted guards with no resolution in scope** —
`audit-ops`, `lifecycle-ops`, `merge-queue-ops`, `task-id-integrity`,
`backlog-pressure-reporter`, `ephemeral-worker-manager`,
`ResearchTaskActionModal`
- **sites where the literal IS the answer** — `eval-signal-collector`
maps a column to an archive-vs-done *label*; `TaskCard` reads a
completion timestamp
- **already resolved on their line** — `triage.ts`,
`restart-recovery-coordinator.ts`, both covered by open PRs
## Measured
| check | result |
|---|---|
| core stall suites | 4 files, **85 tests green** |
| engine merger/runtime suites | **1044 tests green** |
| five gates + strict census | green |
| `tsc` (core, engine) | clean |
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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