Record patch 0.1.1 Python wheel reproducibility blocker

[docushell-dev]

Summary

• record that the approved Python wheel SHA did not match a fresh pre-upload rebuild
• classify the root cause as wheel ZIP metadata timestamp drift, with member byte content unchanged
• record deterministic SOURCE_DATE_EPOCH=0 rebuild evidence and keep PyPI upload blocked pending a new deterministic candidate request/decision

Verification

• python3 .github/scripts/test_patch_0_1_1_python_wheel_reproducibility_blocker.py
• python3 .github/scripts/test_patch_0_1_1_python_publication_approval_decision.py
• python3 .github/scripts/test_release_candidate_prep.py
• python3 .github/scripts/test_milestone_e_source_snapshot_candidate_audit.py
• make light-check PYTHON=python3
• make release-candidate-prep PYTHON=python3
• git diff --check

Boundaries

• no PyPI upload is performed or approved by this PR
• the prior approval decision is treated as historical evidence, not sufficient for upload
• deterministic wheel SHA e0292276e711e75d4f7e1bb8c2c6137c6e89d4c343dd308943eb9b22094ea451 is recorded for a future approval request, not approved here
• hosted surfaces, production positioning, Windows packaged artifacts, bundled PDFium, public benchmark claims, ethos-doc, and ethos-rag remain blocked