fix(#2491): finish todos/done -> todos/completed rename (14 stale refs) + guard (#2626)

* test(#2491): add todos/done rename under-sweep guard

* fix(#2491): finish todos/done -> todos/completed rename (14 stale refs)

* chore(#2491): backfill changeset pr to 2626

* test(#2491): fix lint-legacy-dir-name + allow-test-rule-refs (split legacy token, add issue ref)

tests/workflow-size-baseline.json

@@ -9,7 +9,7 @@
   "audit-milestone.md": 19034,
   "audit-uat.md": 7469,
   "autonomous.md": 42474,
-  "check-todos.md": 9761,
+  "check-todos.md": 9771,
   "cleanup.md": 10319,
   "code-review-fix.md": 24906,
   "code-review.md": 33110,