Summary

• add a regression test proving cron jobs pass their SQLite session DB through to session_search
• exercise the cron AIAgent(session_db=...) wiring through run_job
• avoid LLM summarization in the test by asserting the no-match search path

Testing

• source venv/bin/activate && python -m pytest tests/cron/test_scheduler.py::TestRunJobSessionPersistence -q -n 0
• source venv/bin/activate && python -m pytest tests/cron/test_scheduler.py::TestRunJobSessionPersistence::test_run_job_passes_session_db_and_cron_platform tests/cron/test_scheduler.py::TestRunJobSessionPersistence::test_cron_session_search_uses_passed_session_db -q -n 0

Notes

• During verification, the broader tests/cron/test_scheduler.py -q suite still shows pre-existing failures in TestSilentDelivery::* and TestTickAdvanceBeforeRun::test_advance_called_before_run_job on the current base branch. This PR does not touch that logic.

Closes #6563