The sharpest lane defect left in the backlog, and the one I have been
deferring since the first sweep.
```ts
if (seam === "review-handoff") {
const result = await primitives.transitionTask(primitiveCtx, context.task, {
column: "in-review", // ← post-U12 this is a rejected destination on a renamed board
```
Post-U12 `moveTask` **rejects** a destination the workflow does not
declare. So on any board with a renamed review lane, the handoff threw
`TransitionRejectionError` and **killed the workflow walk mid-run**. Not
a silent wrong answer for once — a hard failure in the middle of a task,
which is why it outranked everything else once it became reachable.
**Why it was deferred:** every fix threads a resolver out of
`executor.ts`, and #2820 was editing that file. It merged at 22:08, so
this was finally free of the conflict.
## The role travels, not the column
Seam handlers in `workflow-node-handlers.ts` are pure functions over an
IR node and a task — no store, no task id to resolve from — so a handler
can only ever name a literal. The runtime primitive in `executor.ts`
**does** hold the store, so the seam now asks for `columnRole: "review"`
and the primitive resolves it against the task's **own** selection.
One authority, deliberately. Answering one question with two reads is
what took #2843 five review rounds, and I would rather not relearn it
here.
Compatibility is preserved in both directions:
- `column` still wins when both are supplied — an explicit destination
is an explicit destination;
- an unresolvable role falls back to the legacy `in-review` rather than
failing the transition, which is exactly the behaviour every caller had
before.
## The test asserts the literal is *gone*, not merely accompanied
`column` takes precedence over `columnRole` downstream, so a diff that
added the role while leaving the literal would look converted and be
completely inert. That is the exact shape this program keeps finding — a
documented fallback in front of a literal that still decides everything
— so the assertion is:
```ts
expect(input.columnRole).toBe("review");
expect(input.column).toBeUndefined(); // ← the half that matters
```
**Revert proof, measured:** restore `column: "in-review"` in the seam
and it fails with `expected undefined to be 'review'`.
## Verification
- `pnpm test:gate` — 161 / 487 / 13 / 71 passed
- `pnpm lint` — clean
- `tsc --noEmit` (`@fusion/engine`) — clean
- new `review-handoff-lane.test.ts` plus the two neighbouring seam
suites — 41 passed
Carries the one-line SQL-baseline re-record (`team-analytics.ts: 6 → 3`)
that #2864 left behind, same as my other open branches — main is red on
it, and identical changes to that line merge without conflict.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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