Adds non-blocking tracks dependency type for convoy to issue relationships:
- Non-blocking: does not affect ready work calculation
- Cross-prefix capable: convoys in hq-* can track issues in gt-*, bd-*
- Reverse lookup: bd dep list <id> --direction=up -t tracks
Also adds bd dep list command with direction and type filtering for
querying dependencies/dependents.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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