docs: document PR publishing requirements

[Xuanwo]

Document the PR publishing requirements in AGENTS.md so agent-created PRs match the checks enforced by CI before they are opened or updated.

This records two required gates:

• PR titles must follow Conventional Commits because .github/workflows/pr-title.yml validates the title and body with commitlint.
• PRs must run lint checks for every touched language surface before creation or update. Rust changes require cargo fmt --all and cargo clippy --all --tests --benches -- -D warnings; Python changes require the python/AGENTS.md environment workflow and uv run make lint from python/.

If a required lint check cannot be run, the blocker must be stated explicitly in the PR summary.

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