docs: add verification evidence guidance

[EmersonBraun]

Summary

• add a compact Verification evidence section to the canonical AGENTS.md example
• keep the README and rendered site source synchronized
• ask contributors to report exact commands and results, disclose checks they could not run, and avoid unsupported success claims

Validation

• pnpm install --frozen-lockfile
• pnpm exec tsc --noEmit
• git diff --check

[vercel]

@EmersonBraun is attempting to deploy a commit to the openai Team on Vercel.

A member of the Team first needs to authorize it.

[Pjrich1313]

Put my name as the agent on this and add my copilot as my verification of my pull and code.

[Pjrich1313]

This has been authorized and looped to waste my copilot usage