feat(gt): Complete command parity for GGT

Add missing gt commands to match PGT functionality:
- gt session restart: Restart polecat session (stop + start)
- gt session status: Show detailed session status with uptime
- gt rig shutdown: Gracefully stop all agents in a rig
- gt mail reply: Convenience command for replying to messages
- gt witness attach: Attach to witness tmux session

Closes: gt-hw6, gt-99m, gt-6db, gt-e76, gt-hzr, gt-sqi

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

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

internal/cmd/mail.go

@@ -29,6 +29,8 @@ var (
 	mailCheckInject   bool
 	mailCheckJSON     bool
 	mailThreadJSON    bool
+	mailReplySubject  string
+	mailReplyMessage  string
 )
 
 var mailCmd = &cobra.Command{
@@ -137,6 +139,23 @@ Examples:
 	RunE: runMailThread,
 }
 
+var mailReplyCmd = &cobra.Command{
+	Use:   "reply <message-id>",
+	Short: "Reply to a message",
+	Long: `Reply to a specific message.
+
+This is a convenience command that automatically:
+- Sets the reply-to field to the original message
+- Prefixes the subject with "Re: " (if not already present)
+- Sends to the original sender
+
+Examples:
+  gt mail reply msg-abc123 -m "Thanks, working on it now"
+  gt mail reply msg-abc123 -s "Custom subject" -m "Reply body"`,
+	Args: cobra.ExactArgs(1),
+	RunE: runMailReply,
+}
+
 func init() {
 	// Send flags
 	mailSendCmd.Flags().StringVarP(&mailSubject, "subject", "s", "", "Message subject (required)")
@@ -161,6 +180,11 @@ func init() {
 	// Thread flags
 	mailThreadCmd.Flags().BoolVar(&mailThreadJSON, "json", false, "Output as JSON")
 
+	// Reply flags
+	mailReplyCmd.Flags().StringVarP(&mailReplySubject, "subject", "s", "", "Override reply subject (default: Re: <original>)")
+	mailReplyCmd.Flags().StringVarP(&mailReplyMessage, "message", "m", "", "Reply message body (required)")
+	mailReplyCmd.MarkFlagRequired("message")
+
 	// Add subcommands
 	mailCmd.AddCommand(mailSendCmd)
 	mailCmd.AddCommand(mailInboxCmd)
@@ -168,6 +192,7 @@ func init() {
 	mailCmd.AddCommand(mailDeleteCmd)
 	mailCmd.AddCommand(mailCheckCmd)
 	mailCmd.AddCommand(mailThreadCmd)
+	mailCmd.AddCommand(mailReplyCmd)
 
 	rootCmd.AddCommand(mailCmd)
 }
@@ -629,6 +654,71 @@ func runMailThread(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+func runMailReply(cmd *cobra.Command, args []string) error {
+	msgID := args[0]
+
+	// Find workspace
+	workDir, err := findBeadsWorkDir()
+	if err != nil {
+		return fmt.Errorf("not in a Gas Town workspace: %w", err)
+	}
+
+	// Determine current address
+	from := detectSender()
+
+	// Get the original message
+	router := mail.NewRouter(workDir)
+	mailbox, err := router.GetMailbox(from)
+	if err != nil {
+		return fmt.Errorf("getting mailbox: %w", err)
+	}
+
+	original, err := mailbox.Get(msgID)
+	if err != nil {
+		return fmt.Errorf("getting message: %w", err)
+	}
+
+	// Build reply subject
+	subject := mailReplySubject
+	if subject == "" {
+		if strings.HasPrefix(original.Subject, "Re: ") {
+			subject = original.Subject
+		} else {
+			subject = "Re: " + original.Subject
+		}
+	}
+
+	// Create reply message
+	reply := &mail.Message{
+		From:     from,
+		To:       original.From, // Reply to sender
+		Subject:  subject,
+		Body:     mailReplyMessage,
+		Type:     mail.TypeReply,
+		Priority: mail.PriorityNormal,
+		ReplyTo:  msgID,
+		ThreadID: original.ThreadID,
+	}
+
+	// If original has no thread ID, create one
+	if reply.ThreadID == "" {
+		reply.ThreadID = generateThreadID()
+	}
+
+	// Send the reply
+	if err := router.Send(reply); err != nil {
+		return fmt.Errorf("sending reply: %w", err)
+	}
+
+	fmt.Printf("%s Reply sent to %s\n", style.Bold.Render("✓"), original.From)
+	fmt.Printf("  Subject: %s\n", subject)
+	if original.ThreadID != "" {
+		fmt.Printf("  Thread: %s\n", style.Dim.Render(original.ThreadID))
+	}
+
+	return nil
+}
+
 // generateThreadID creates a random thread ID for new message threads.
 func generateThreadID() string {
 	b := make([]byte, 6)

internal/cmd/rig.go

@@ -11,8 +11,12 @@ import (
 	"github.com/steveyegge/gastown/internal/beads"
 	"github.com/steveyegge/gastown/internal/config"
 	"github.com/steveyegge/gastown/internal/git"
+	"github.com/steveyegge/gastown/internal/refinery"
 	"github.com/steveyegge/gastown/internal/rig"
+	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/style"
+	"github.com/steveyegge/gastown/internal/tmux"
+	"github.com/steveyegge/gastown/internal/witness"
 	"github.com/steveyegge/gastown/internal/workspace"
 )
 
@@ -77,12 +81,32 @@ Examples:
 	RunE: runRigReset,
 }
 
+var rigShutdownCmd = &cobra.Command{
+	Use:   "shutdown <rig>",
+	Short: "Gracefully stop all rig agents",
+	Long: `Stop all agents in a rig.
+
+This command gracefully shuts down:
+- All polecat sessions
+- The refinery (if running)
+- The witness (if running)
+
+Use --force to skip graceful shutdown and kill immediately.
+
+Examples:
+  gt rig shutdown gastown
+  gt rig shutdown gastown --force`,
+	Args: cobra.ExactArgs(1),
+	RunE: runRigShutdown,
+}
+
 // Flags
 var (
 	rigAddPrefix      string
 	rigAddCrew        string
 	rigResetHandoff   bool
 	rigResetRole      string
+	rigShutdownForce  bool
 )
 
 func init() {
@@ -91,12 +115,15 @@ func init() {
 	rigCmd.AddCommand(rigListCmd)
 	rigCmd.AddCommand(rigRemoveCmd)
 	rigCmd.AddCommand(rigResetCmd)
+	rigCmd.AddCommand(rigShutdownCmd)
 
 	rigAddCmd.Flags().StringVar(&rigAddPrefix, "prefix", "", "Beads issue prefix (default: derived from name)")
 	rigAddCmd.Flags().StringVar(&rigAddCrew, "crew", "main", "Default crew workspace name")
 
 	rigResetCmd.Flags().BoolVar(&rigResetHandoff, "handoff", false, "Clear handoff content")
 	rigResetCmd.Flags().StringVar(&rigResetRole, "role", "", "Role to reset (default: auto-detect from cwd)")
+
+	rigShutdownCmd.Flags().BoolVarP(&rigShutdownForce, "force", "f", false, "Force immediate shutdown")
 }
 
 func runRigAdd(cmd *cobra.Command, args []string) error {
@@ -302,3 +329,73 @@ func pathExists(path string) bool {
 	_, err := os.Stat(path)
 	return err == nil
 }
+
+func runRigShutdown(cmd *cobra.Command, args []string) error {
+	rigName := args[0]
+
+	// Find workspace
+	townRoot, err := workspace.FindFromCwdOrError()
+	if err != nil {
+		return fmt.Errorf("not in a Gas Town workspace: %w", err)
+	}
+
+	// Load rigs config and get rig
+	rigsPath := filepath.Join(townRoot, "mayor", "rigs.json")
+	rigsConfig, err := config.LoadRigsConfig(rigsPath)
+	if err != nil {
+		rigsConfig = &config.RigsConfig{Rigs: make(map[string]config.RigEntry)}
+	}
+
+	g := git.NewGit(townRoot)
+	rigMgr := rig.NewManager(townRoot, rigsConfig, g)
+	r, err := rigMgr.GetRig(rigName)
+	if err != nil {
+		return fmt.Errorf("rig '%s' not found", rigName)
+	}
+
+	fmt.Printf("Shutting down rig %s...\n", style.Bold.Render(rigName))
+
+	var errors []string
+
+	// 1. Stop all polecat sessions
+	t := tmux.NewTmux()
+	sessMgr := session.NewManager(t, r)
+	infos, err := sessMgr.List()
+	if err == nil && len(infos) > 0 {
+		fmt.Printf("  Stopping %d polecat session(s)...\n", len(infos))
+		if err := sessMgr.StopAll(rigShutdownForce); err != nil {
+			errors = append(errors, fmt.Sprintf("polecat sessions: %v", err))
+		}
+	}
+
+	// 2. Stop the refinery
+	refMgr := refinery.NewManager(r)
+	refStatus, err := refMgr.Status()
+	if err == nil && refStatus.State == refinery.StateRunning {
+		fmt.Printf("  Stopping refinery...\n")
+		if err := refMgr.Stop(); err != nil {
+			errors = append(errors, fmt.Sprintf("refinery: %v", err))
+		}
+	}
+
+	// 3. Stop the witness
+	witMgr := witness.NewManager(r)
+	witStatus, err := witMgr.Status()
+	if err == nil && witStatus.State == witness.StateRunning {
+		fmt.Printf("  Stopping witness...\n")
+		if err := witMgr.Stop(); err != nil {
+			errors = append(errors, fmt.Sprintf("witness: %v", err))
+		}
+	}
+
+	if len(errors) > 0 {
+		fmt.Printf("\n%s Some agents failed to stop:\n", style.Warning.Render("⚠"))
+		for _, e := range errors {
+			fmt.Printf("  - %s\n", e)
+		}
+		return fmt.Errorf("shutdown incomplete")
+	}
+
+	fmt.Printf("%s Rig %s shut down successfully\n", style.Success.Render("✓"), rigName)
+	return nil
+}

internal/cmd/session.go

@@ -7,6 +7,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/spf13/cobra"
 	"github.com/steveyegge/gastown/internal/config"
@@ -114,6 +115,27 @@ Examples:
 	RunE: runSessionInject,
 }
 
+var sessionRestartCmd = &cobra.Command{
+	Use:   "restart <rig>/<polecat>",
+	Short: "Restart a polecat session",
+	Long: `Restart a polecat session (stop + start).
+
+Gracefully stops the current session and starts a fresh one.
+Use --force to skip graceful shutdown.`,
+	Args: cobra.ExactArgs(1),
+	RunE: runSessionRestart,
+}
+
+var sessionStatusCmd = &cobra.Command{
+	Use:   "status <rig>/<polecat>",
+	Short: "Show session status details",
+	Long: `Show detailed status for a polecat session.
+
+Displays running state, uptime, session info, and activity.`,
+	Args: cobra.ExactArgs(1),
+	RunE: runSessionStatus,
+}
+
 func init() {
 	// Start flags
 	sessionStartCmd.Flags().StringVar(&sessionIssue, "issue", "", "Issue ID to work on")
@@ -132,6 +154,9 @@ func init() {
 	sessionInjectCmd.Flags().StringVarP(&sessionMessage, "message", "m", "", "Message to inject")
 	sessionInjectCmd.Flags().StringVarP(&sessionFile, "file", "f", "", "File to read message from")
 
+	// Restart flags
+	sessionRestartCmd.Flags().BoolVarP(&sessionForce, "force", "f", false, "Force immediate shutdown")
+
 	// Add subcommands
 	sessionCmd.AddCommand(sessionStartCmd)
 	sessionCmd.AddCommand(sessionStopCmd)
@@ -139,6 +164,8 @@ func init() {
 	sessionCmd.AddCommand(sessionListCmd)
 	sessionCmd.AddCommand(sessionCaptureCmd)
 	sessionCmd.AddCommand(sessionInjectCmd)
+	sessionCmd.AddCommand(sessionRestartCmd)
+	sessionCmd.AddCommand(sessionStatusCmd)
 
 	rootCmd.AddCommand(sessionCmd)
 }
@@ -413,3 +440,108 @@ func runSessionInject(cmd *cobra.Command, args []string) error {
 		style.Bold.Render("✓"), rigName, polecatName)
 	return nil
 }
+
+func runSessionRestart(cmd *cobra.Command, args []string) error {
+	rigName, polecatName, err := parseAddress(args[0])
+	if err != nil {
+		return err
+	}
+
+	mgr, _, err := getSessionManager(rigName)
+	if err != nil {
+		return err
+	}
+
+	// Check if running
+	running, err := mgr.IsRunning(polecatName)
+	if err != nil {
+		return fmt.Errorf("checking session: %w", err)
+	}
+
+	if running {
+		// Stop first
+		if sessionForce {
+			fmt.Printf("Force stopping session for %s/%s...\n", rigName, polecatName)
+		} else {
+			fmt.Printf("Stopping session for %s/%s...\n", rigName, polecatName)
+		}
+		if err := mgr.Stop(polecatName, sessionForce); err != nil {
+			return fmt.Errorf("stopping session: %w", err)
+		}
+	}
+
+	// Start fresh session
+	fmt.Printf("Starting session for %s/%s...\n", rigName, polecatName)
+	opts := session.StartOptions{}
+	if err := mgr.Start(polecatName, opts); err != nil {
+		return fmt.Errorf("starting session: %w", err)
+	}
+
+	fmt.Printf("%s Session restarted. Attach with: %s\n",
+		style.Bold.Render("✓"),
+		style.Dim.Render(fmt.Sprintf("gt session at %s/%s", rigName, polecatName)))
+	return nil
+}
+
+func runSessionStatus(cmd *cobra.Command, args []string) error {
+	rigName, polecatName, err := parseAddress(args[0])
+	if err != nil {
+		return err
+	}
+
+	mgr, _, err := getSessionManager(rigName)
+	if err != nil {
+		return err
+	}
+
+	// Get session info
+	info, err := mgr.Status(polecatName)
+	if err != nil {
+		return fmt.Errorf("getting status: %w", err)
+	}
+
+	// Format output
+	fmt.Printf("%s Session: %s/%s\n\n", style.Bold.Render("📺"), rigName, polecatName)
+
+	if info.Running {
+		fmt.Printf("  State: %s\n", style.Bold.Render("● running"))
+	} else {
+		fmt.Printf("  State: %s\n", style.Dim.Render("○ stopped"))
+		return nil
+	}
+
+	fmt.Printf("  Session ID: %s\n", info.SessionID)
+
+	if info.Attached {
+		fmt.Printf("  Attached: yes\n")
+	} else {
+		fmt.Printf("  Attached: no\n")
+	}
+
+	if !info.Created.IsZero() {
+		uptime := time.Since(info.Created)
+		fmt.Printf("  Created: %s\n", info.Created.Format("2006-01-02 15:04:05"))
+		fmt.Printf("  Uptime: %s\n", formatDuration(uptime))
+	}
+
+	fmt.Printf("\nAttach with: %s\n", style.Dim.Render(fmt.Sprintf("gt session at %s/%s", rigName, polecatName)))
+	return nil
+}
+
+// formatDuration formats a duration for human display.
+func formatDuration(d time.Duration) string {
+	if d < time.Minute {
+		return fmt.Sprintf("%ds", int(d.Seconds()))
+	}
+	if d < time.Hour {
+		return fmt.Sprintf("%dm %ds", int(d.Minutes()), int(d.Seconds())%60)
+	}
+	hours := int(d.Hours())
+	mins := int(d.Minutes()) % 60
+	if hours >= 24 {
+		days := hours / 24
+		hours = hours % 24
+		return fmt.Sprintf("%dd %dh %dm", days, hours, mins)
+	}
+	return fmt.Sprintf("%dh %dm", hours, mins)
+}

internal/cmd/witness.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"os/exec"
 	"path/filepath"
 
 	"github.com/spf13/cobra"
@@ -11,6 +12,7 @@ import (
 	"github.com/steveyegge/gastown/internal/git"
 	"github.com/steveyegge/gastown/internal/rig"
 	"github.com/steveyegge/gastown/internal/style"
+	"github.com/steveyegge/gastown/internal/tmux"
 	"github.com/steveyegge/gastown/internal/witness"
 	"github.com/steveyegge/gastown/internal/workspace"
 )
@@ -65,6 +67,20 @@ Displays running state, monitored polecats, and statistics.`,
 	RunE: runWitnessStatus,
 }
 
+var witnessAttachCmd = &cobra.Command{
+	Use:     "attach <rig>",
+	Aliases: []string{"at"},
+	Short:   "Attach to witness session",
+	Long: `Attach to the Witness tmux session for a rig.
+
+Attaches the current terminal to the witness's tmux session.
+Detach with Ctrl-B D.
+
+If the witness is not running, this will start it first.`,
+	Args: cobra.ExactArgs(1),
+	RunE: runWitnessAttach,
+}
+
 func init() {
 	// Start flags
 	witnessStartCmd.Flags().BoolVar(&witnessForeground, "foreground", false, "Run in foreground (default: background)")
@@ -76,6 +92,7 @@ func init() {
 	witnessCmd.AddCommand(witnessStartCmd)
 	witnessCmd.AddCommand(witnessStopCmd)
 	witnessCmd.AddCommand(witnessStatusCmd)
+	witnessCmd.AddCommand(witnessAttachCmd)
 
 	rootCmd.AddCommand(witnessCmd)
 }
@@ -213,3 +230,58 @@ func runWitnessStatus(cmd *cobra.Command, args []string) error {
 
 	return nil
 }
+
+// witnessSessionName returns the tmux session name for a rig's witness.
+func witnessSessionName(rigName string) string {
+	return fmt.Sprintf("gt-witness-%s", rigName)
+}
+
+func runWitnessAttach(cmd *cobra.Command, args []string) error {
+	rigName := args[0]
+
+	// Verify rig exists
+	_, r, err := getWitnessManager(rigName)
+	if err != nil {
+		return err
+	}
+
+	t := tmux.NewTmux()
+	sessionName := witnessSessionName(rigName)
+
+	// Check if session exists
+	running, err := t.HasSession(sessionName)
+	if err != nil {
+		return fmt.Errorf("checking session: %w", err)
+	}
+
+	if !running {
+		// Start witness session (like Mayor)
+		fmt.Printf("Starting witness session for %s...\n", rigName)
+
+		if err := t.NewSession(sessionName, r.Path); err != nil {
+			return fmt.Errorf("creating session: %w", err)
+		}
+
+		// Set environment
+		t.SetEnvironment(sessionName, "GT_ROLE", "witness")
+		t.SetEnvironment(sessionName, "GT_RIG", rigName)
+
+		// Launch Claude in a respawn loop
+		loopCmd := `while true; do echo "👁️ Starting Witness for ` + rigName + `..."; claude --dangerously-skip-permissions; echo ""; echo "Witness exited. Restarting in 2s... (Ctrl-C to stop)"; sleep 2; done`
+		if err := t.SendKeysDelayed(sessionName, loopCmd, 200); err != nil {
+			return fmt.Errorf("sending command: %w", err)
+		}
+	}
+
+	// Attach to the session
+	tmuxPath, err := exec.LookPath("tmux")
+	if err != nil {
+		return fmt.Errorf("tmux not found: %w", err)
+	}
+
+	attachCmd := exec.Command(tmuxPath, "attach-session", "-t", sessionName)
+	attachCmd.Stdin = os.Stdin
+	attachCmd.Stdout = os.Stdout
+	attachCmd.Stderr = os.Stderr
+	return attachCmd.Run()
+}

internal/session/manager.go

@@ -59,6 +59,15 @@ type Info struct {
 
 	// RigName is the rig this session belongs to.
 	RigName string `json:"rig_name"`
+
+	// Attached indicates if someone is attached to the session.
+	Attached bool `json:"attached,omitempty"`
+
+	// Created is when the session was created.
+	Created time.Time `json:"created,omitempty"`
+
+	// Windows is the number of tmux windows.
+	Windows int `json:"windows,omitempty"`
 }
 
 // sessionName generates the tmux session name for a polecat.
@@ -170,6 +179,56 @@ func (m *Manager) IsRunning(polecat string) (bool, error) {
 	return m.tmux.HasSession(sessionID)
 }
 
+// Status returns detailed status for a polecat session.
+func (m *Manager) Status(polecat string) (*Info, error) {
+	sessionID := m.sessionName(polecat)
+
+	running, err := m.tmux.HasSession(sessionID)
+	if err != nil {
+		return nil, fmt.Errorf("checking session: %w", err)
+	}
+
+	info := &Info{
+		Polecat:   polecat,
+		SessionID: sessionID,
+		Running:   running,
+		RigName:   m.rig.Name,
+	}
+
+	if !running {
+		return info, nil
+	}
+
+	// Get detailed session info
+	tmuxInfo, err := m.tmux.GetSessionInfo(sessionID)
+	if err != nil {
+		// Non-fatal - return basic info
+		return info, nil
+	}
+
+	info.Attached = tmuxInfo.Attached
+	info.Windows = tmuxInfo.Windows
+
+	// Parse created time from tmux format (e.g., "Thu Dec 19 10:30:00 2025")
+	if tmuxInfo.Created != "" {
+		// Try common tmux date formats
+		formats := []string{
+			"Mon Jan 2 15:04:05 2006",
+			"Mon Jan _2 15:04:05 2006",
+			time.ANSIC,
+			time.UnixDate,
+		}
+		for _, format := range formats {
+			if t, err := time.Parse(format, tmuxInfo.Created); err == nil {
+				info.Created = t
+				break
+			}
+		}
+	}
+
+	return info, nil
+}
+
 // List returns information about all sessions for this rig.
 func (m *Manager) List() ([]Info, error) {
 	sessions, err := m.tmux.ListSessions()