refactor: remove bd daemon code from gastown

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>

internal/cmd/status.go

@@ -189,10 +189,6 @@ func runStatusOnce(_ *cobra.Command, _ []string) error {
 		return fmt.Errorf("not in a Gas Town workspace: %w", err)
 	}
 
-	// Check bd daemon health and attempt restart if needed
-	// This is non-blocking - if daemons can't be started, we show a warning but continue
-	bdWarning := beads.EnsureBdDaemonHealth(townRoot)
-
 	// Load town config
 	townConfigPath := constants.MayorTownPath(townRoot)
 	townConfig, err := config.LoadTownConfig(townConfigPath)
@@ -404,12 +400,6 @@ func runStatusOnce(_ *cobra.Command, _ []string) error {
 		return err
 	}
 
-	// Show bd daemon warning at the end if there were issues
-	if bdWarning != "" {
-		fmt.Printf("%s %s\n", style.Warning.Render("⚠"), bdWarning)
-		fmt.Printf("  Run 'bd daemon killall && bd daemon start' to restart daemons\n")
-	}
-
 	return nil
 }