spec_version field in vectors.json follows Semantic Versioning (SemVer) rules.
Versioning Rules
- Patch (1.0.x): Added non-breaking test vectors or updated documentation.
- Minor (1.x.0): Added new features that are backward-compatible (e.g., a new warning code).
- Major (x.0.0): Breaking changes to the routing logic or output schema.
All implementation packages must release the same version number to guarantee cross-language compliance.