Addresses the PR #100 review round 2. Q#AS12's ownership rule guarded the
sweep but not the RELEASE paths, so three doors were still open.
The rule is now total: exactly two things may release an unclaimed
recovery file --- recover-file (which adopts it) and discard-recovery
(explicit user intent). Not a sweep, not a save, not a kill.
- HIGH: buffer.after-save called _discard_buffer unconditionally, which
removed the live buffer's current-path key without checking ownership.
Repro: session 1 autosaves and crashes; session 2 opens the file, does
not recover, then saves --- the crash artifact was deleted. Same door
was open on kill. discard_buffer now removes ONLY keys this session
owns. The unclaimed copy survives (reported Stale, so never
auto-offered, but still recoverable/discardable). The on-disk file holds
the new work; the crash copy holds work never written anywhere, so
deleting it was the same data loss by a different door.
- MEDIUM/LOW: _adopt only recorded the path in `owned`, not an
association with the buffer. A removal callback fires after the buffer
has left the registry, so discard_buffer had no path to read and no
`written` entry to fall back on --- recover-then-kill leaked the copy
and it was offered again. adopt now takes the BUFFER and records a
`written` entry at the revision whose contents the file holds. That is
correct twice over: the skip cache declines to rewrite an identical
copy, and a kill can find and retire it.
- LOW: _discard(path) removed the file and unowned the hash but left
matching `written` entries, so a still-dirty buffer hit the unchanged
(path_hash, revision) fast path and went unprotected until its next
edit. discard_path now clears those entries; the next sweep re-protects
immediately.
Tests (autosave_acceptance now 24):
saving_without_recovering_preserves_unclaimed_crash_data,
killing_without_recovering_preserves_unclaimed_crash_data,
recover_then_kill_retires_the_adopted_recovery,
discard_recovery_lets_the_next_sweep_reprotect_immediately.
Gates: fmt + workspace clippy clean; lib 1499; crdt 1670; autosave 24;
desktop 11; persistence 5; GPU 58; git diff --check clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Levi Neuwirth
b8a296f0a3