Replace 4-6 parallel bd subprocess calls with a single consolidated query.
This reduces inbox check time from ~10.5s to <100ms by eliminating
subprocess spawning overhead.
Changes:
- Remove parallel query pattern with sync.WaitGroup
- Single `bd list --type message --all --limit 0` query
- Filter results in Go for assignee/CC matches and status
- Remove unused queryResult type and queryMessages function
Fixes: bd-2zd.3
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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