Remove all code that calls bd daemon commands, as bd daemon functionality
has been removed from beads:
- Delete internal/beads/daemon.go (CheckBdDaemonHealth, StopAllBdProcesses, etc.)
- Delete internal/beads/daemon_test.go
- Delete internal/doctor/bd_daemon_check.go (BdDaemonCheck health check)
- Remove bd daemon health check from gt status
- Remove bd daemon stopping from gt down
- Remove bd daemon cleanup from gt install
- Remove BdDaemonCheck registration from gt doctor
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>