Polish v9 public metadata language

[jang1563]

Summary

• Rewrites the v9 public bulk card as a reader-facing metadata catalog instead of an alpha/decision-boundary memo.
• Removes public-surface alpha, decision, and provenance wording from v9 README surfaces.
• Replaces the remaining v7 HF card provenance phrase with audit-metadata wording.
• Adds consistency checks so the old v9 internal-review language does not re-enter public docs.

QA

• python3 scripts/validate_public_docs_consistency.py
• python3 -m unittest tests/test_public_docs_consistency.py tests/test_release_manifest.py
• git diff --check
• make release-qa
• make hpc-public-qa