Protect recordings from empty captures and stale deletions

[ComputelessComputer]

Discard only confirmed empty scheduled desktop audio. Preserve unseen recording and note content across synced deletions while keeping intentional deletion and mobile recording behavior intact.

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Note

High Risk
Changes E2EE session deletion and restoration semantics plus automatic local audio removal; incorrect guards or reconciliation could delete valid recordings or resurrect or drop synced session data.

Overview
Scheduled desktop captures can now be dropped when they turn out to be empty: auto-starts are tagged as automatic, lifecycle markers remember pre-recording audio state and the initial title, and on stop the app runs discardEmptyAutomaticCapture before cataloging audio or batch work. That path uses a new audio_has_speech fs-sync command (VAD in fs-sync-core) and only deletes local audio when speech is confidently absent and the note is still unchanged, empty, and unattached; manual starts stay manual even if a scheduled waiter exists.

Synced session deletions gain observation-based reconciliation so notes are not lost to tombstones the deleter never saw. Migrations add content_version on documents/transcripts, deletion_context on sessions, a session_content_observations view, local restore triggers when real content arrives offline, and reconcile_session_deletion during E2EE replica apply. Intentional deletes still stick once observed content matches; empty/metadata-only writes do not resurrect deleted sessions.

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