- Add Pinned field to Issue struct in types.go
- Create migration 023 to add pinned column with partial index
- Update SQLite GetBlockedIssues to filter WHERE pinned = 0
- Update Memory GetBlockedIssues to skip pinned issues
- Update schema.go with pinned column definition
Pinned issues are tracked but excluded from the blocked list to
reduce noise for issues that are intentionally parked.
Closes: beads-ei4
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>