Documents the amber-app change that records a film whose TV is switched off
with it on screen. session_summary gains ended (closed | unseen), lastSeenAt
and playedOn; a session held on disk and never closed is written once at the
next launch, with its one health row; a new error row, session_hold_failed,
records a hold that could not be written, released or read.
Includes the measurement that ruled out a lifecycle hook: on the kids' box
ff3bcf, 13 of 13 films in 14 days left no summary, with no callback at their
end and 0 of 3572 api_usage rows delivered late.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude
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