- The Overview's thumbnail row is its own read of the thumbnail status:
"Checking thumbnails…" until it answers, unavailable when it fails.
- The health job is tracked in the Activity store (new store.track) and
followed through its event stream instead of polling every 150 ms.
- A host save before a read returned a revision fails without a request;
System reads the host values on mount and after a conflict.
- "100+ problems found" when the integrity count is capped.
- D-NEW-S2-5 is D123 everywhere; the unused Overview hand-off is gone.
- The concept spec builds the health report from the concept's own rows
and asserts the full unmapped path list; surface tops pin the 18px
offset.
- TESTING.md: D96's reason, the read-only (WAL/SHM) standard, the UNC URI
and the new behavior. Coverage floors raised for the touched files.