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Blind-review round 6 (Sonnet xhigh) finding: a transient lock on the rotated generation (AV/EDR or an editor, chiefly Windows) failed the whole append — and since the live file stays oversized, every later append re-entered the same failing branch, silently dropping every record until the lock cleared. Rotation is now best-effort: on failure the line appends unrotated and the size cap re-applies once a later rotation succeeds. Unix regression locks the directory and asserts the line survives. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Signed-off-by: Max Lampert <maxwell@squareup.com>