fix(identity): copy all agent fields during polecat identity rename

The rename operation was only copying AgentState and CleanupStatus,
missing HookBead (the primary fix), ActiveMR, and NotificationLevel.
This ensures all agent state is preserved when renaming an identity.

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

internal/cmd/polecat_identity.go

@@ -591,10 +591,13 @@ func runPolecatIdentityRename(cmd *cobra.Command, args []string) error {
 
 	// Create new identity bead with inherited fields
 	newFields := &beads.AgentFields{
-		RoleType:      "polecat",
-		Rig:           rigName,
-		AgentState:    oldFields.AgentState,
-		CleanupStatus: oldFields.CleanupStatus,
+		RoleType:          "polecat",
+		Rig:               rigName,
+		AgentState:        oldFields.AgentState,
+		HookBead:          oldFields.HookBead,
+		CleanupStatus:     oldFields.CleanupStatus,
+		ActiveMR:          oldFields.ActiveMR,
+		NotificationLevel: oldFields.NotificationLevel,
 	}
 
 	newTitle := fmt.Sprintf("Polecat %s in %s", newName, rigName)