## What
Adds a typed, queryable catalogue for engine run-audit events as the
first step of the delivery-pipeline reliability & observability effort.
- **New module** `packages/engine/src/run-audit/run-audit-catalogue.ts`
— a typed registry describing run-audit event kinds (scheduler,
self-healing, merger, worktree, symbol-lock, …) so pipeline
observability can ingest and reason about them consistently.
- **Parity test** `run-audit-catalogue.test.ts` — asserts the catalogue
matches the emitted run-audit event space.
- **Docs** `docs/run-audit.md` + index pointer.
## Why
Run-audit events are currently emitted ad-hoc without a typed contract.
A catalogue gives:
- a single source of truth for event kinds/names,
- a parity guard so any new or renamed event is caught,
- a foundation for delivery-pipeline reliability dashboards.
## Verification
- `@fusion/engine` `tsc` build → **PASS**
- `vitest run run-audit-catalogue.test.ts` → **3 tests passed**
- No production behavior change outside the new module.
## Scope
New isolated module + its test + docs. No changesets/release artifacts.
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## Summary by CodeRabbit
* **Documentation**
* Added a run-audit catalogue covering delivery-pipeline finalization,
self-healing reconciliation, and durable-agent error events.
* Documented recorded outcomes, emission conditions, audit-store
querying, and event catalogue maintenance.
* Added a documentation index entry linking to the new catalogue.
* **Tests**
* Added validation to ensure documented audit events remain complete,
consistently formatted, and synchronized with the supported event
catalogue.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Fusion <noreply@runfusion.ai>
