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41add341 - update PR template and highlight AI-agent setup for contributors (#13913)

update PR template and highlight AI-agent setup for contributors (#13913) * docs: surface AI-agent setup for contributors Most code contributions now involve a coding agent, but the agent setup (`make claude`/`make codex`, the conventions in `.ai/`) is opt-in and easy to miss, so agents run without project context and produce PRs that ignore conventions. Surface it where contributors will see it: - README: pointer to `.ai/` / `make claude` in the contribution section - PR template: an AI-agent setup + self-review checkbox (now the first item), folding the typo/docs exception into the philosophy-doc check, and dropping the deprecated JAX reviewer routing (Flax is slated for removal in v0.40.0; MPS kept) Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * docs: nest the AI-agent checklist into a parent + sub-items Make the AI-agent item a parent checkbox ("Did you use an AI agent?") with two sub-checkboxes (point it at .ai/ conventions; self-review against .ai/review-rules.md). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>