Summary

• explicitly shut down one-shot CLI agents, memory providers, and session DBs after hermes -z
• skip next-turn external memory prefetch for one-shot runs
• stop Honcho's session-manager async writer during provider shutdown

Test Plan

• venv/bin/python -m pytest -o addopts='' tests/run_agent/test_memory_sync_interrupted.py tests/cli/test_cli_shutdown_memory_messages.py -q — 21 passed, 1 warning
• hermes -p bob -z 'Say stable in one word.' — exit 0
• hermes -p ghost -z 'Say stable in one word.' — exit 0
• hermes -p warden -z 'Say stable in one word.' — exit 0
• thread-dump harness exits 0 with only MainThread at atexit