chore: import upstream snapshot with attribution

scripts/ops/prune-stale-worktrees.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+# Lista (ou remove com --apply) worktrees port-* cuja branch já foi merged ao
+# main OU não tem commits à frente do origin/main. NUNCA toca worktrees com
+# trabalho não-commitado. Rodar a partir do checkout principal.
+set -euo pipefail
+APPLY="${1:-}"
+git fetch origin main --quiet || true
+git worktree list --porcelain | awk '/^worktree /{w=$2} /^branch /{print w" "$2}' | \
+while read -r dir ref; do
+  case "$dir" in
+    *"/.claude/worktrees/"*port-*|*"/.worktrees/"*port-*) ;;
+    *) continue ;;
+  esac
+  br="${ref#refs/heads/}"
+  if [ -n "$(git -C "$dir" status --porcelain 2>/dev/null)" ]; then
+    echo "SKIP (dirty): $dir"
+    continue
+  fi
+  ahead=$(git -C "$dir" rev-list --count origin/main.."$br" 2>/dev/null || echo "?")
+  if [ "$ahead" = "0" ]; then
+    if [ "$APPLY" = "--apply" ]; then
+      git worktree remove --force "$dir" && git branch -D "$br" 2>/dev/null || true
+      echo "REMOVED: $dir ($br)"
+    else
+      echo "WOULD REMOVE (0 ahead of main): $dir ($br)"
+    fi
+  else
+    echo "KEEP ($ahead ahead): $dir ($br)"
+  fi
+done
+echo "Done.${APPLY:+ (applied)}"