Replace bd subprocess spawns with direct SQLite queries:
- queryEpicsInDir: direct sqlite3 query vs bd list subprocess
- getLinkedConvoys: direct JOIN query vs bd dep list + getIssueDetails loop
- computeGoalLastMovement: reuse epic.UpdatedAt vs separate bd show call
Also includes mailbox optimization from earlier session:
- Consolidated multiple parallel queries into single bd list --all query
- Filters in Go instead of spawning O(identities × statuses) bd processes
177x improvement (6.2s → 35ms) by eliminating subprocess overhead.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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