Native Windows identity tests return mismatch instead of abstain #1842

Two existing identity tests fail on native Windows at main 9f026dad3bf70b464d62cf315ae1cc03396a6ad9: the OCR identity result is mismatch, while the tests require abstain.

Reproduce headlessly from packages/flow:

pytest -q tests/test_identity_homonym_8th.py::test_wrong_patient_does_not_verify_via_real_replayer_ocr_tier tests/test_identity_ocr_conservative_9th.py::test_numeric_100512_collapses_and_abstains_arial

• test_identity_homonym_8th.py:158 expects check.status == "abstain"; actual: "mismatch". The preceding check.status != "verified" assertion passes.
• test_identity_ocr_conservative_9th.py:195 expects "abstain"; actual: "mismatch". Its preceding assertions establish byte-identical OCR for the 100512 / 1OO512 Arial fixture.

No wrong-record verified result occurs in these failures. Diagnose the classification and make the existing assertions pass unchanged; keep the fail-closed behavior.

Environment: Windows 11 x64, Python 3.12.4, pytest 9.1.1, Pydantic 2.13.4, OpenCV 4.13.0.92, rapidocr-onnxruntime 1.4.4 and onnxruntime 1.24.3. Tests render synthetic fixtures without opening GUI windows. The same failures reproduce on #1743 at 43ff31046 and #1773 at 26b951f9a; they predate those PRs. Both broader identity runs pass on Linux (158 and 181 cases).

Validate the fix on native Windows and Linux. Do not loosen, remove or skip these tests.