Optimize getWorkersForIssues() from O(N×R) to O(R) subprocess calls:
- Batch sqlite queries per rig using WHERE hook_bead IN (...)
- Parallelize rig lookups with goroutines
Expected improvement: 300-600ms → 50-100ms for moderate convoys
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>