[.ai] add self-review skill, retire parity-testing skill, and tighten the agent guides
- New `self-review` skill mirroring the `@claude` CI review (rubric from
review-rules.md, call-path dead-code analysis), report-only, with the report
flagging what to fix before submitting (blocking + dead code) vs what to leave
for the actual review.
- Remove the WIP `parity-testing` skill; preserve its pitfalls as
`model-integration/pitfalls.md` (numerical-discrepancy reference).
- model-integration: restructure around a grouped checklist, default-to-modular,
an overall file-structure sketch (details deferred to the guides), a
fresh-conversion `Model parity test` example (internal, not shipped), and a
filled-in weight/checkpoint-conversion section.
- Centralize the loading rule (from_pretrained / from_single_file, no custom
loaders) in models.md; add per-folder File structure sections to models.md /
pipelines.md; default-to-modular note in pipelines.md.
- AGENTS.md: dedicated 'Self-review before a PR' and 'Reference guides' sections.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>