Add bd daemon health check at the start of gt status:
- Check daemon health via bd daemon health --json
- Attempt restart if daemons are unhealthy (version mismatch, stale, unresponsive)
- Show warning at end of status output if daemons could not be started
- Non-blocking: status display continues regardless of daemon state
This prevents the 39+ second slowdown when bd daemons are not running
properly, as each bd command falls back to slow direct mode.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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