feat(dnd): Add notification level control (gt-xmsme)

Implements Do Not Disturb mode for Gas Town agents:

- Add notification_level to agent bead schema (verbose, normal, muted)
- gt dnd [on|off|status] - quick toggle for DND mode
- gt notify [verbose|normal|muted] - fine-grained control
- gt nudge checks target DND status, skips if muted
- --force flag on nudge to override DND

This allows agents (especially Mayor) to mute notifications
during focused work like swarm coordination.

Generated with Claude Code

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

internal/cmd/notify.go

@@ -0,0 +1,131 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+	"github.com/steveyegge/gastown/internal/beads"
+	"github.com/steveyegge/gastown/internal/style"
+	"github.com/steveyegge/gastown/internal/workspace"
+)
+
+var notifyCmd = &cobra.Command{
+	Use:     "notify [verbose|normal|muted]",
+	GroupID: GroupComm,
+	Short:   "Set notification level",
+	Long: `Control the notification level for the current agent.
+
+Notification levels:
+  verbose  All notifications (mail, convoy events, status updates)
+  normal   Important notifications only (default)
+  muted    Silent/DND mode - batch notifications for later
+
+Without arguments, shows the current notification level.
+
+Examples:
+  gt notify           # Show current level
+  gt notify verbose   # Enable all notifications
+  gt notify normal    # Default notification level
+  gt notify muted     # Enable DND mode
+
+Related: gt dnd - quick toggle for DND mode`,
+	Args: cobra.MaximumNArgs(1),
+	RunE: runNotify,
+}
+
+func init() {
+	rootCmd.AddCommand(notifyCmd)
+}
+
+func runNotify(cmd *cobra.Command, args []string) error {
+	// Get current agent bead ID
+	cwd, err := os.Getwd()
+	if err != nil {
+		return fmt.Errorf("getting current directory: %w", err)
+	}
+
+	townRoot, err := workspace.FindFromCwdOrError()
+	if err != nil {
+		return fmt.Errorf("not in a Gas Town workspace: %w", err)
+	}
+
+	roleInfo, err := GetRoleWithContext(cwd, townRoot)
+	if err != nil {
+		return fmt.Errorf("determining role: %w", err)
+	}
+
+	ctx := RoleContext{
+		Role:     roleInfo.Role,
+		Rig:      roleInfo.Rig,
+		Polecat:  roleInfo.Polecat,
+		TownRoot: townRoot,
+		WorkDir:  cwd,
+	}
+
+	agentBeadID := getAgentBeadID(ctx)
+	if agentBeadID == "" {
+		return fmt.Errorf("could not determine agent bead ID for role %s", roleInfo.Role)
+	}
+
+	bd := beads.New(townRoot)
+
+	// Get current level
+	currentLevel, err := bd.GetAgentNotificationLevel(agentBeadID)
+	if err != nil {
+		// Agent bead might not exist yet - default to normal
+		currentLevel = beads.NotifyNormal
+	}
+
+	// No args: show current level
+	if len(args) == 0 {
+		showNotificationLevel(currentLevel)
+		return nil
+	}
+
+	// Set new level
+	newLevel := args[0]
+	switch newLevel {
+	case beads.NotifyVerbose, beads.NotifyNormal, beads.NotifyMuted:
+		// Valid level
+	default:
+		return fmt.Errorf("invalid level %q: use verbose, normal, or muted", newLevel)
+	}
+
+	if err := bd.UpdateAgentNotificationLevel(agentBeadID, newLevel); err != nil {
+		return fmt.Errorf("setting notification level: %w", err)
+	}
+
+	fmt.Printf("%s Notification level set to %s\n", style.SuccessPrefix, style.Bold.Render(newLevel))
+	showNotificationLevelDescription(newLevel)
+
+	return nil
+}
+
+func showNotificationLevel(level string) {
+	if level == "" {
+		level = beads.NotifyNormal
+	}
+
+	icon := "🔔"
+	switch level {
+	case beads.NotifyVerbose:
+		icon = "🔊"
+	case beads.NotifyMuted:
+		icon = "🔕"
+	}
+
+	fmt.Printf("%s Notification level: %s\n", icon, style.Bold.Render(level))
+	showNotificationLevelDescription(level)
+}
+
+func showNotificationLevelDescription(level string) {
+	switch level {
+	case beads.NotifyVerbose:
+		fmt.Printf("  %s\n", style.Dim.Render("All notifications: mail, convoy events, status updates"))
+	case beads.NotifyNormal:
+		fmt.Printf("  %s\n", style.Dim.Render("Important notifications: convoy landed, escalations"))
+	case beads.NotifyMuted:
+		fmt.Printf("  %s\n", style.Dim.Render("Silent mode: notifications batched for later review"))
+	}
+}