_finalize_session decides whether the TUI backend ends the state.db row
(gateway-owned source → no; another backend holds the lease → no; automatic
Desktop reclaim → no, #105588). _teardown_session then calls agent.close(),
whose _finalize_owned_session_row ends the same row as "agent_close" through
the agent's own handle whenever _end_session_on_close is still True — so every
spare decision was undone one call later. Verified with real SessionDB +
AIAgent.close(): with only the #105620 guard a Desktop ws_orphan_reap still
lands ended_at + end_reason="agent_close" (the #105588 follow-up report).
One seam after the lifecycle decision now clears agent._end_session_on_close
whenever the row was spared, replacing the gateway-owned-only assignment from
#111145 so the lease-held and Desktop-reclaim cases get the same treatment.
The five mocked _finalize_session tests from #105620 are replaced by two
real-DB _teardown_session tests beside the #111145 harness (red on both
origin/main and the bare cherry-picks, green on the stack).
kshitijk4poor
dfc40a50a9