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5651a73331
Before this, _process_message_background's finally did an unconditional 'del self._active_sessions[session_key]' — even if a /stop/ /new command had already swapped in its own command_guard via _dispatch_active_session_command and cancelled us. The old task's unwind would clobber the newer guard, opening a race for follow-ups. Replace with _release_session_guard(session_key, guard=interrupt_event) so the delete only fires when the guard we captured is still the one installed. The sibling _session_tasks pop already had equivalent ownership matching via asyncio.current_task() identity; this closes the asymmetry. Adds two direct regressions in test_session_split_brain_11016: - stale guard reference must not clobber a newer guard by identity - guard=None default still releases unconditionally (for callers that don't have a captured guard to match against) Refs #11016