Close patch 0.1.2 crates publication

[docushell-dev]

Summary

• records crates.io closeout evidence for ethos-doc-core, ethos-verify, and ethos-pdf at 0.1.2
• adds a release-candidate guard with live exact-version crates.io checks for the 0.1.2 closeout
• fixes the historical 0.1.1 crates closeout guard to check exact versions instead of latest cargo search output
• keeps Rust public install wording, PyPI, hosted, production, Windows, bundled PDFium, benchmark, ethos-doc, and ethos-rag surfaces blocked

Verification

• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_patch_0_1_2_crates_publication_closeout.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_patch_0_1_1_crates_publication_closeout.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_patch_0_1_2_crates_publication_approval_decision.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_patch_0_1_2_crates_publication_approval_request.py
• PYTHONDONTWRITEBYTECODE=1 python3 .github/scripts/test_release_candidate_prep.py
• cargo search ethos-doc-core --limit 1
• cargo search ethos-verify --limit 1
• cargo search ethos-pdf --limit 1
• make light-check PYTHON=python3
• make release-candidate-prep PYTHON=python3
• git diff --check