## Summary
- restore the owned PostgreSQL backend bootstrap for layer-less
`CentralCore.init()` callers
- fix node, mesh, and project CLI commands returning empty state and
logging `backendHandle is only available in backend mode` during cleanup
- add a hermetic regression test for standalone backend ownership and
shutdown
PR #2454 accidentally added an unconditional early return immediately
before the existing standalone bootstrap. Runtime pool sharing remains
unchanged: `attachBackendLayer()` releases the central-only connections
before adopting the project store layer.
## Verification
- RED: regression failed because `createCentralBackendLayer` had zero
calls
- GREEN: focused regression passes
- `pnpm --filter @fusion/core typecheck`
- `pnpm --filter @fusion/core build`
- `pnpm test` with `FUSION_PG_TEST_SKIP=1`: 482 engine + 132 Core gate +
71 CLI shape + changed regression passed; isolation clean
- changeset format check passed
The local PostgreSQL merge-gate harness is unavailable without
credentials (`empty password returned by client`), so its 10 tests were
explicitly skipped rather than misreported.
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## Summary by CodeRabbit
* **Bug Fixes**
* Restored PostgreSQL central registry access for standalone
Node/mesh/project CLI commands without marking the host offline on
shutdown.
* Improved CentralCore lifecycle handling: concurrent `init()`
coalesces, and operations are blocked once `close()` is requested/in
progress.
* Refined embedded PostgreSQL runtime shutdown: owner stop is
coordinated with lease release, registrations are rejected while
stopping, and shutdown/teardown uses lease lifecycle consistently.
Embedded start failures now treat stopping as retryable.
* **Tests**
* Expanded coverage for CentralCore close/init/attach races and embedded
PostgreSQL lease/shutdown coordination scenarios.
* **Documentation**
* Updated Changeset notes to clarify CLI and shutdown semantics.
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