Changelog

Unreleased
- Initial repository bootstrap with policy, scripts, schemas, and CI.
- Enforced snapshot-level `as_of` propagation for deterministic artifacts.
- Compat report blockers now use pinned-version PyPI metadata.
- Model defaults schema/payload now include modalities and token limits.
- CI runs test discovery, determinism unit test, and fixture schema validation.
- Root `llms.txt` now links to stable `/latest` artifacts.