## Summary
Fusion’s core runtime now treats PostgreSQL as the authoritative
metadata store without leaving current CLI, dashboard, desktop, or
engine composition roots uncompilable between stack layers. This is the
99-file foundation for the larger cutover: subsequent PRs migrate the
remaining consumers, plugins, and operator surfaces.
## Design decisions
- Runtime store construction fails closed when an asynchronous
PostgreSQL layer is unavailable; SQLite remains readable only at
explicit migration and identity-recovery boundaries.
- Project ownership is enforced across active, archived, workflow,
mission, analytics, and plugin-schema data.
- The small set of cross-package files in this layer are
compatibility-critical call sites required for a green intermediate
commit, not the complete consumer migration.
- Schema migration 0008 remains assigned to session-advisor state from
current `main`; mission lineage idempotency advances to 0009 so neither
invariant can be skipped.
## Validation
- All affected package typechecks pass: Core, Engine, Dashboard, CLI,
and Desktop.
- `pnpm test:gate` passes: 478 tests across the engine gate, PostgreSQL
core gate, and CLI workflow shape.
- The PR changes exactly 99 files.
## Stack
This is the base PR. Engine/dashboard, CLI/desktop/ops, plugins, and
docs/release follow as stacked PRs, each below 100 changed files.
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 standard runtime backend, with embedded
PostgreSQL enabled by default.
* Added project-scoped storage for tasks, archives, chat sessions,
missions, knowledge pages, and operational data.
* Improved archived-task search, filtering, pagination, and restoration.
* Added safer plugin schema initialization with validation and project
isolation.
* Added PostgreSQL-backed workflow, mission, validator, and dashboard
capabilities.
* **Bug Fixes**
* Improved startup timeout cancellation and resource cleanup.
* Prevented cross-project data access and phantom reservation cleanup
errors.
* Ensured archived tasks remain read-only and asynchronous writes
complete reliably.
* Retired SQLite opt-out settings with clear startup errors.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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