andrexibiza's review on #101118 pointed out that the timeout branch
still ran the SessionDB close/checkpoint even when _shutdown_executor()
reported a live worker -- the exact sequence that produces the
wrong-page-number corruption in #101093. The close block now only runs
when _exec_live == 0; a surviving worker skips it entirely and leaves
the handle open for SQLite to recover from its own WAL on next open.
Adds test_stuck_worker_skips_the_session_db_close to prove the converse
of the existing ordering test: a worker that outlives the budget must
never be raced by close().
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019JujDvCo2vfpEiizidAS2U
joaomarcos
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