- content-hash: createRepoContentSnapshot — 2 repo-wide git spawns shared across all hash computations (was ~2 spawns x N packages x 2 passes, ~0.6-1.6s per cache-miss run); snapshot-equivalence test pins zero-spawn path
- test-changed: one hash memo + snapshot shared between applyCacheToPlan and recordCachePass (record pass now re-hashes nothing)
- ci-test-shard: listPackageTestFiles single source of truth for the test-file glob (was triplicated)
- check-test-inventory: curatedProjects defaults to projects (removes duplicated 11-entry list in spec)
- ensure-test-artifacts: drop detectMissingArtifacts passthrough alias
- drop dead statSync re-export; cross-reference comments on the two shared-input path lists
Skipped deliberately: --cold-start-probe/--check-timings-staleness removal (plan artifacts for U8 re-eval + scheduled refresh), best-fit dedup + threshold² (behavior-preserving refactor of verified shard math — follow-up), worker-budget duplication (pre-existing on main)
- 427 orphaned dashboard test files ran in NO gate; 395 now gated via self-maintaining backfill lanes (glob minus curated minus skip-list), 31 pre-existing failures + build-output skip-listed with reasons
- settings -t name-filter lanes replaced by one unfiltered lane (describe blocks can no longer fall through filters)
- scripts/check-test-inventory.mjs: --capture/--diff superset harness + --dashboard-curated completeness guard
- pr-checks.yml: engine-slow CI gate (non-empty assertion) + inventory guard job
- docs/testing.md: guard, skip-list policy, harness usage
