fix(spawn): resolve variable shadowing and branch deletion edge case

- Move router and polecatAddress definitions before if block to avoid
  shadowing (defining same vars inside and after the block)
- Handle branch deletion failure in Recreate() by checking if branch
  still exists and using WorktreeAddExisting like Add() does

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

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

internal/cmd/spawn.go

@@ -141,6 +141,9 @@ func runSpawn(cmd *cobra.Command, args []string) error {
 	polecatGit := git.NewGit(r.Path)
 	polecatMgr := polecat.NewManager(r, polecatGit)
 
+	// Router for mail operations (used for checking inbox and sending assignments)
+	router := mail.NewRouter(r.Path)
+
 	// Auto-select polecat if not specified
 	if polecatName == "" {
 		polecatName, err = selectIdlePolecat(polecatMgr, r)
@@ -160,6 +163,9 @@ func runSpawn(cmd *cobra.Command, args []string) error {
 		}
 	}
 
+	// Address for this polecat (used for mail operations)
+	polecatAddress := fmt.Sprintf("%s/%s", rigName, polecatName)
+
 	// Check if polecat exists
 	existingPolecat, err := polecatMgr.Get(polecatName)
 	polecatExists := err == nil
@@ -196,8 +202,6 @@ func runSpawn(cmd *cobra.Command, args []string) error {
 		}
 
 		// Check for unread mail (indicates existing unstarted work)
-		polecatAddress := fmt.Sprintf("%s/%s", rigName, polecatName)
-		router := mail.NewRouter(r.Path)
 		mailbox, mailErr := router.GetMailbox(polecatAddress)
 		if mailErr == nil {
 			_, unread, _ := mailbox.Count()
@@ -229,10 +233,6 @@ func runSpawn(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("getting polecat: %w", err)
 	}
 
-	// Define polecatAddress and router for later use (mail sending)
-	polecatAddress := fmt.Sprintf("%s/%s", rigName, polecatName)
-	router := mail.NewRouter(r.Path)
-
 	// Beads operations use rig-level beads (at rig root, not mayor/rig)
 	beadsPath := r.Path