9e2ee1889f
- Add OpHealth RPC operation to protocol - Implement handleHealth() with DB ping and 1s timeout - Returns status (healthy/degraded/unhealthy), uptime, cache metrics - Update TryConnect() to use health check instead of ping - Add 'bd daemon --health' CLI command with JSON output - Track cache hits/misses for metrics - Unhealthy daemon triggers automatic fallback to direct mode - Health check completes in <2 seconds Amp-Thread-ID: https://ampcode.com/threads/T-1a4889f3-77cf-433a-a704-e1c383929f48 Co-authored-by: Amp <amp@ampcode.com>