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**Stacked on #3109** — merge that first; this is its first consumer. ## Census | Metric | Before | After | |---|---:|---:| | COLUMN guards (backlog) | 47 | **43** | | `executor.ts` | 4 | **0** | `executor.ts` is off the census top-files list. ## Why these four could not be converted in place This listener is synchronous and its branches **start execution**, dispose worktrees and release sessions. An await ahead of them defers the `execute()` dispatch itself. The sync IR resolver isn't an option either — it answers with the default workflow under PostgreSQL, so a guard written through it is inert. Reading the lanes the emitter already resolved costs nothing and leaves the prologue synchronous. This listener is the reason #3109 has the shape it does. ## The archive branch is the one with teeth `to === "archived"` matched nothing on a board with a renamed terminal lane, so **archiving never released the task's active-session registry entry** — and that entry is what blocks a **successor** task from acquiring the same path. Not cosmetic: the next task wanting that path fails to register. ## Verification - **Revert-proof:** the new case drives a `shipped` terminal lane (matching no legacy id) and asserts the release. Reverting the branch to the literal leaves the entry held — `expected [Array(1)] to have a length of 0`. - 43 executor suites — **483 green** - **`pnpm test:gate` green**; eslint clean ## Note on shape Lanes are read as **single ids, not sets**, because each branch here is a lane-identity test on one column — exactly what the literals were. Widening to membership would change behaviour, not just vocabulary. Fail-soft to the legacy ids when the emit path could not resolve, matching every other consumer of this payload. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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