fix: restore agent override support lost in manager refactors

The manager refactors (ea8bef2, 72544cc0) conflicted with the agent
override feature, causing regressions:

Deacon (ea8bef2):
- Lost agentOverride parameter
- Re-added respawn loop (removed in 5f2e16f)
- Lost GUPP (startup + propulsion nudges)

Crew (72544cc0):
- Lost agentOverride wiring to StartOptions
- --agent flag had no effect on crew refresh/restart

This fix restores agent override support and GUPP while keeping
improvements from the manager refactors (zombie detection, etc).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/crew_lifecycle.go

@@ -236,9 +236,10 @@ func runCrewRefresh(cmd *cobra.Command, args []string) error {
 
 	// Use manager's Start() with refresh options
 	err = crewMgr.Start(name, crew.StartOptions{
-		KillExisting: true,      // Kill old session if running
-		Topic:        "refresh", // Startup nudge topic
-		Interactive:  true,      // No --dangerously-skip-permissions
+		KillExisting:  true,             // Kill old session if running
+		Topic:         "refresh",        // Startup nudge topic
+		Interactive:   true,             // No --dangerously-skip-permissions
+		AgentOverride: crewAgentOverride,
 	})
 	if err != nil {
 		return fmt.Errorf("starting crew session: %w", err)
@@ -346,8 +347,9 @@ func runCrewRestart(cmd *cobra.Command, args []string) error {
 		// Use manager's Start() with restart options
 		// Start() will create workspace if needed (idempotent)
 		err = crewMgr.Start(name, crew.StartOptions{
-			KillExisting: true,     // Kill old session if running
-			Topic:        "restart", // Startup nudge topic
+			KillExisting:  true,             // Kill old session if running
+			Topic:         "restart",        // Startup nudge topic
+			AgentOverride: crewAgentOverride,
 		})
 		if err != nil {
 			fmt.Printf("Error restarting %s: %v\n", arg, err)
@@ -425,8 +427,9 @@ func runCrewRestartAll() error {
 
 		// Use manager's Start() with restart options
 		err = crewMgr.Start(agent.AgentName, crew.StartOptions{
-			KillExisting: true,     // Kill old session if running
-			Topic:        "restart", // Startup nudge topic
+			KillExisting:  true,             // Kill old session if running
+			Topic:         "restart",        // Startup nudge topic
+			AgentOverride: crewAgentOverride,
 		})
 		if err != nil {
 			failed++

internal/cmd/start.go

@@ -203,7 +203,7 @@ func startCoreAgents(townRoot string, agentOverride string) error {
 
 	// Start Deacon (health monitor)
 	deaconMgr := deacon.NewManager(townRoot)
-	if err := deaconMgr.Start(); err != nil {
+	if err := deaconMgr.Start(agentOverride); err != nil {
 		if err == deacon.ErrAlreadyRunning {
 			fmt.Printf("  %s Deacon already running\n", style.Dim.Render("○"))
 		} else {
@@ -694,6 +694,7 @@ func runStartCrew(cmd *cobra.Command, args []string) error {
 	err = crewMgr.Start(name, crew.StartOptions{
 		Account:         startCrewAccount,
 		ClaudeConfigDir: claudeConfigDir,
+		AgentOverride:   startCrewAgentOverride,
 	})
 	if err != nil {
 		if errors.Is(err, crew.ErrSessionRunning) {

internal/cmd/up.go

@@ -83,7 +83,7 @@ func runUp(cmd *cobra.Command, args []string) error {
 
 	// 2. Deacon (Claude agent)
 	deaconMgr := deacon.NewManager(townRoot)
-	if err := deaconMgr.Start(); err != nil {
+	if err := deaconMgr.Start(""); err != nil {
 		if err == deacon.ErrAlreadyRunning {
 			printStatus("Deacon", true, deaconMgr.SessionName())
 		} else {