fix(polecat): don't block nuke for stale hooks pointing to closed beads (gt-jc7bq)

When checking if a polecat can be nuked, verify that any hooked bead is
still active (not closed). If the hooked bead was closed externally, the
hook is stale and should not block the nuke.

Also shows 'stale' in dry-run output when hook points to a closed bead.

internal/cmd/polecat.go

@@ -1289,12 +1289,25 @@ func runPolecatNuke(cmd *cobra.Command, args []string) error {
 				}
 
 				// Check 3: Work on hook (check both Issue.HookBead from slot and fields.HookBead)
+				// Only flag as blocking if the hooked bead is still in an active status.
+				// If the hooked bead was closed externally (gt-jc7bq), don't block nuke.
 				hookBead := agentIssue.HookBead
 				if hookBead == "" {
 					hookBead = fields.HookBead
 				}
 				if hookBead != "" {
-					reasons = append(reasons, fmt.Sprintf("has work on hook (%s)", hookBead))
+					// Check if hooked bead is still active (not closed)
+					hookedIssue, err := bd.Show(hookBead)
+					if err == nil && hookedIssue != nil {
+						// Only block if bead is still active (not closed)
+						if hookedIssue.Status != "closed" {
+							reasons = append(reasons, fmt.Sprintf("has work on hook (%s)", hookBead))
+						}
+						// If closed, the hook is stale - don't block nuke
+					} else {
+						// Can't verify hooked bead - be conservative
+						reasons = append(reasons, fmt.Sprintf("has work on hook (%s, unverified)", hookBead))
+					}
 				}
 			}
 
@@ -1386,7 +1399,13 @@ func runPolecatNuke(cmd *cobra.Command, args []string) error {
 					hookBead = fields.HookBead
 				}
 				if hookBead != "" {
-					fmt.Printf("    - Hook: %s (%s)\n", style.Error.Render("has work"), hookBead)
+					// Check if hooked bead is still active
+					hookedIssue, err := bd.Show(hookBead)
+					if err == nil && hookedIssue != nil && hookedIssue.Status == "closed" {
+						fmt.Printf("    - Hook: %s (%s, closed - stale)\n", style.Warning.Render("stale"), hookBead)
+					} else {
+						fmt.Printf("    - Hook: %s (%s)\n", style.Error.Render("has work"), hookBead)
+					}
 				} else {
 					fmt.Printf("    - Hook: %s\n", style.Success.Render("empty"))
 				}