feat(validation): exact-head claim promotion gates

[seonghobae]

Summary

#37–#56 remain review-blocked (no independent APPROVE). #45 marked ready again. Next no-0008 gap: ADR 0014 exact-head claim promotion in existing validation_core (no new crate; remaining STM/DSEM/morphology wait on #48/#49/#53).

• Four authorities stay distinct: decision_accepted, implemented_main, scientifically_supported, released
• Implementation/scientific/release bind to one exact protected-head SHA
• Queued checks, predecessor-head results, skipped required tests, and LLM judgments fail closed
• Scientific promotion uses computed RMSE and its standard error, not a hardcoded threshold

Test plan

• RED: claim_promotion_contract failed with E0432/E0599
• cargo test -p validation_core --offline
• cargo clippy -p validation_core --all-targets --offline -- -D warnings
• python3 scripts/validate_documentation.py and check_docstrings.py
• line coverage 313/313
• exact-head required Checks (do not treat queued evidence as passed)

Do not self-approve or merge. Prefer merge #37 then #45 when eligible. Do not allocate 0008.

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