- seal() now runs before the final dispose close() and bumps the disk
epoch: work an event handler enqueues while dispose awaits the closing
tail is superseded, and an already-running fenced or authoritative
rewrite fails its commit guard at the rename fence instead of
publishing over a file a revival reopened.
- The authoritative repair path resets the disk tail itself, escaping the
close() serialization, and would atomically publish the emptied entry
list; it now no-ops once sealed and commit guards also check the seal.
- Execution-time gates cover the queued title persist and fenced rewrite
callbacks; setSessionName/appendCustomEntry attempted by a handler that
outlives dispose are dropped and covered by the seal regression, and a
failed atomic batch across the seal can no longer truncate the file.
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