The _find_beads_db_in_tree() function now follows .beads/redirect files
to find shared beads databases. This is essential for polecat/crew
directories that use redirect files to share a central database.
Changes:
- Added _resolve_beads_redirect() helper function
- Updated _find_beads_db_in_tree() to check for redirect files before
looking for local .db files
- Added comprehensive tests for redirect functionality
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>