fix: replace assert with runtime guard in session recovery

[JonthanaHanh]

Summary

assert output is not None at session_recovery.py:1241 is stripped by python -O, silently removing the invariant check before output.parent is accessed on the next line.

Replace with an explicit if output is None: raise SessionRecoverySafetyError(...) using the same error class that other validation checks in this function already use.

Changes

• hermes_cli/session_recovery.py:1241: assert output is not None → if output is None: raise SessionRecoverySafetyError(...)

Test Plan

• Syntax check passes
• SessionRecoverySafetyError is already imported in the file

[teknium1]

Thanks for tightening this recovery invariant. The targeted guard matches the module's existing safety-error convention.

Problems

• The change has no regression test for its stated optimized-Python behavior. recover_session_database() still relies on the assertion at hermes_cli/session_recovery.py:1241 on current main, while existing recovery calls in tests/hermes_cli/test_session_recovery.py:435 and :516 provide valid output paths.

Suggested changes

• Add a focused python -O regression test passing output_path=None directly to recover_session_database() and asserting SessionRecoverySafetyError. The CLI already rejects a missing output at hermes_cli/sessions_cmd.py:143-145, so direct API coverage is the relevant path.

Automated hermes-sweeper review.

[teknium1]

Please add a regression test that invokes this path under python -O with output_path=None and asserts SessionRecoverySafetyError; that directly protects the optimization-sensitive behavior this guard replaces.