## Summary
Main Full Suite was red again after release/desktop workflow drift,
engine mock gaps, mission landed-SHA gating, and compound-engineering PG
admin auth on GHA (`USER=runner`).
## Fixes
| Area | Failure | Fix |
|------|---------|-----|
| desktop `release-workflow` | expected old `find artifacts -type f` |
assert pruned collect + `release-files/*` |
| `step-session-executor` | missing
`resolveExecutorFallbackThinkingLevel` | mock export |
| tool-availability tests | empty tools (cascade from above) | fixed by
mock |
| `skill-resolver` | TDZ on `mockFiles` during import | `vi.hoisted`
filesystem state |
| `merge-error-recovery` | enqueue no-op when not started | set
`started=true` |
| mission behavioral posture | `blocked` (no landed SHA / git probe) |
`mergeDetails.commitSha` + staleness stub |
| GraphTaskNode | missing `useOptionalToast` | mock both toast exports |
| CE `pipeline-store.pg` | psql as `runner` | admin via
`FUSION_PG_TEST_URL_BASE` |
## Test plan
- [x] step-session-executor, skill-resolver, merge-error-recovery,
mission-validator-behavioral-posture (203)
- [x] release-workflow (10)
- [x] `pnpm --filter @fusion/engine test:core` (294)
- [ ] Full Suite (non-blocking) after merge
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Bug Fixes**
- Improved desktop release artifact collection by pruning nested
`runtime` and `migrations` directories and consistently staging release
uploads via a dedicated `release-files` mapping.
- **Tests**
- Enhanced engine merge error-recovery coverage and mission validator
behavioral posture setup.
- Improved test reliability by synchronizing mocked filesystem state,
executor fallbacks, and toast hook variants.
- Updated Postgres test harness/admin commands to use a configurable
base URL; refined related Windows changeset description.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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