test(ci): stabilize state-lock mutation oracle - #4863

Summary

• bind fence_unshared_state_lock to the existing in-process TypeScript state-lock ordering test
• remove dependence on Python-to-Node subprocess startup completing within the oracle's 200 ms observation window
• keep the production lock implementation and mutation unchanged

Evidence

The #4859 CI artifact executed all 54 mutants but killed only 53; fence_unshared_state_lock survived because the cross-process oracle passed unchanged. The same full suite kills 54/54 locally with this mapping.

Verification

• full mutation suite: 54/54 killed
• focused mutant: 6/6 repeated runs killed it by assertion
• tests/test_python_ci_workflow.py: 44 passed
• Ruff passed
• premerge validation gate passed