## Summary
CLI commands, daemon/dashboard startup, packaged desktop startup, and
live-data maintenance scripts now share the mandatory PostgreSQL
lifecycle. Operators no longer risk a command silently reading or
writing a disconnected SQLite shadow when PostgreSQL setup fails.
## Design decisions
- Every startup owner retains and awaits its PostgreSQL shutdown
callback, including partial-startup failure paths.
- CLI project context and lock-retry flows resolve through asynchronous
project stores.
- Maintenance scripts use the shared backend helper; explicit database
migration/inspection remains the only CLI surface allowed to read legacy
SQLite sources.
## Validation
- CLI and Desktop typechecks pass on the stacked branch.
- `pnpm test:gate` passes all 478 gate tests.
- This PR changes 54 files.
## Stack
- Depends on #2109, which depends on #2108.
- Bundled plugins and docs/release follow in later PRs.
Related: #2105
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* PostgreSQL is now the authoritative store for structured project and
task metadata.
* Projects can be recognized and initialized using
`.fusion/project.json`, without creating a legacy SQLite database.
* CLI commands now retry transient PostgreSQL contention errors.
* **Bug Fixes**
* Improved cleanup when commands complete, fail, or run in the
background, preventing lingering resources.
* Improved desktop, server, and session shutdown reliability.
* **Documentation**
* Updated storage and standalone binary guidance to reflect PostgreSQL
and legacy SQLite compatibility.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
