feat(completion): optimize ID prefix filtering and add completions to more commands
Improvements to shell completions from PR #935:
1. Add IDPrefix field to IssueFilter for efficient database-level filtering
- Queries are now filtered at SQL level instead of fetching all issues
- Updated sqlite, transaction, and memory stores to support IDPrefix
2. Add ValidArgsFunction to additional commands:
- dep (add, remove, list, tree)
- comments, comment (add)
- delete
- graph
- label (add, remove, list)
- duplicate, supersede
- audit
- move
- relate, unrelate
- refile
- gate (show, resolve, add-waiter)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Executed-By: beads/crew/dave
Rig: beads
Role: crew