docs: document the website branch in AGENTS.md

[KARTIKrocks]

Add a Documentation website section explaining the docs site lives on the separate website branch, its stack and GitHub Pages deploy, and the version/API sync obligations when the public API changes.

Summary

Motivation

Fixes #

Changes

Test Plan

• make all passes (fmt, vet, lint, test, build)

Checklist

• Tests added or updated for changed behavior
• No breaking changes — or breaking changes described below

Breaking Changes

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📥 Commits

Reviewing files that changed from the base of the PR and between b74b686 and 48bb4f4.

📒 Files selected for processing (1)

• AGENTS.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/agents-website-section

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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