chore(quality): improve code quality and update dependencies

[fvaleye]

Description

Improve code quality and update dependencies

---

Note

Precompiles regex sets in DataRules, changes constructors and validation methods to use them (and return results directly), updates tests, and bumps dependencies.

• Core (rust/src/metadata_guardian.rs):
  • Add precompiled RegexSet to DataRules (with #[serde(skip)]), implement custom PartialEq/Eq.
  • Change DataRules::new to return Result and build RegexSet; from_path reconstructs via temp struct.
  • Simplify validate_word/validate_words to return results directly; use precompiled set and parallel iteration; optimize validate_file similarly.
• Tests (rust/tests/data_guardian_test.rs):
  • Update to new API (no unwrap() on validate_word/validate_words); minor assertions adjusted.
• Dependencies:
  • Bump regex to 1.12, serde_yaml to 0.9; refresh Cargo.lock with wide crate updates.

^{Written by Cursor Bugbot for commit e3e52cd. This will update automatically on new commits. Configure here.}