Close patch 0.1.2 current status

[docushell-dev]

Summary

• record patch 0.1.2 current-state closeout for the approved evaluation surfaces
• add a release-candidate guard for the closeout record and status docs
• keep hosted, production, Windows, bundled PDFium, benchmark, ethos-doc, and ethos-rag blockers explicit

Verification

• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_patch_0_1_2_current_state_closeout.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_release_candidate_prep.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_execution_status.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_public_prealpha_wording_approval.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_public_surface_posture.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/claims_gate.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/public_boundary_claims_gate.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_validation_record_integrity.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_milestone_e_package_publication_evidence_records.py
• make light-check PYTHON=python3
• make milestone-e-prep PYTHON=python3
• make release-candidate-prep PYTHON=python3
• git diff --check