Add parity with bd list for filtering:
- Exact priority match with --priority/-p
- Pattern matching: --title-contains, --desc-contains, --notes-contains
- Empty/null checks: --empty-description, --no-assignee, --no-labels
- Allow empty query when filters are provided (e.g., bd search --no-assignee)
All filters work in both direct and daemon mode via RPC.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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