Reading a session by id that missed the caller's store fell through to
_locate_session_db(), which opened every profile's state.db read-only and
returned the first owner's full transcript — no opt-in, no profile named, and
the miss path even fired after an explicit non-matching profile= read. Any
caller holding an id (ids appear in logs and tool output) could read a
foreign profile's conversation. Profiles are isolated islands by design.
A miss now stays a miss, with a hint to name the owning profile
(profile=<name> / @session:<profile>/<id>), which remains the sanctioned,
explicit cross-profile read. The schema eval runner no longer needs to fake
the scan.
Reported by the #106761 filer; reproduced by @kokhlo. Refs #87779.
df0eed4f6b