- Add TaskSourceIssue contract and thread sourceIssue through Task, TaskCreateInput, archived task entries, and TaskStore serialization paths.
- Extend SQLite schema to v45 with sourceIssue* columns and add migration coverage for v44 upgrades plus legacy JSON migration import.
- Persist, update, clear, and archive/unarchive sourceIssue metadata in TaskStore with dedicated regression tests.
- Update core and dashboard tests to schema v45 expectations and stabilize flaky modal assertions with async waits.
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