gt hook: Display mail details when mail bead hooked (gt-frhcq.2)

When a mail bead (type=message) is on hook, gt hook now shows:
- From: <sender>
- Subject: <title>
- Run: gt mail read <id>

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

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

internal/cmd/molecule_status.go

@@ -578,6 +578,18 @@ func outputMoleculeStatus(status MoleculeStatusInfo) error {
 	fmt.Println(style.Bold.Render("🚀 AUTONOMOUS MODE - Work on hook triggers immediate execution"))
 	fmt.Println()
 
+	// Check if this is a mail bead - display mail-specific format
+	if status.PinnedBead.Type == "message" {
+		sender := extractMailSender(status.PinnedBead.Labels)
+		fmt.Printf("%s %s (mail)\n", style.Bold.Render("🪝 Hook:"), status.PinnedBead.ID)
+		if sender != "" {
+			fmt.Printf("   From: %s\n", sender)
+		}
+		fmt.Printf("   Subject: %s\n", status.PinnedBead.Title)
+		fmt.Printf("   Run: gt mail read %s\n", status.PinnedBead.ID)
+		return nil
+	}
+
 	fmt.Printf("%s %s: %s\n", style.Bold.Render("🪝 Hooked:"), status.PinnedBead.ID, status.PinnedBead.Title)
 
 	// Show attached molecule
@@ -851,6 +863,17 @@ func isTownLevelRole(agentID string) bool {
 	return agentID == "mayor" || agentID == "deacon"
 }
 
+// extractMailSender extracts the sender from mail bead labels.
+// Mail beads have a "from:X" label containing the sender address.
+func extractMailSender(labels []string) string {
+	for _, label := range labels {
+		if strings.HasPrefix(label, "from:") {
+			return strings.TrimPrefix(label, "from:")
+		}
+	}
+	return ""
+}
+
 // scanAllRigsForHookedBeads scans all registered rigs for hooked beads
 // assigned to the target agent. Used for town-level roles that may have
 // work hooked in any rig.