Record the tmp/acceptance and target/mutation-workers bloat that made
mutate4javascript worker copies many GB and mutation runs appear to hang.
Add a startup check that flags any of these dirs over 100MB so they are
cleaned before a mutation run.
By architect.
Extract the post-lookup-with-null helper into a shared module used by both
the notifications and post query adapters, removing duplication. Add a
dedicated NotificationsQuery unit suite (26 tests) and hardening tests that
kill the sort-comparator and followee-guard mutations. Refresh mutation
manifests via the approved tool. Document 5 intrinsic mutation equivalents
and 16 soft-Gherkin equivalents in the review summary.
By architect.