common: Add an AGENTS.md

[cgwalters]

Let's include some standard instructions, based
on https://agents.md/

[gemini-code-assist]

Summary of Changes

Hello @cgwalters, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to standardize how AI agents interact with the repository by introducing a comprehensive AGENTS.md file. This new document outlines critical instructions for AI-generated commits, focusing on the necessity of human review for Signed-off-by tags and proper attribution for generated code. Additionally, a configuration file was updated with a 'DO NOT EDIT' warning to ensure consistency with its canonical source.

Highlights

• New AI Agent Guidelines: Introduced AGENTS.md to provide explicit instructions for AI agents on commit practices.
• Commit Signing Policy: Specified that AI agents must not include Signed-off-by on automatically generated commits, requiring human review.
• Code Attribution: Established a guideline for AI agents to include Assisted-by: TOOLNAME (MODELNAME) when generating substantial code.
• Configuration File Update: Added a 'DO NOT EDIT' header to common/.gemini/config.yaml to indicate its canonical source.
• Claude Configuration Link: Updated common/.claude/CLAUDE.md to reference the new AGENTS.md.

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[gemini-code-assist]

Code Review

This pull request introduces a standardized AGENTS.md file containing instructions for AI agents, focusing on commit generation, Signed-off-by trailers, and attribution. It also adds a symlink for Claude to use these instructions and updates the Gemini configuration with a canonical source comment. The changes are well-structured and promote consistency. My feedback includes a suggestion to make the instructions for handling DCO failures more explicit by providing example commands, which will improve clarity and user experience.