Add AGENTS.md

[yuecideng]

Description

Add AGENTS.md for github copilot reference. Also change CLAUDE.md to point to AGENTS.md.

Type of change

• Enhancement (non-breaking change which improves an existing functionality)

Screenshots

Please attach before and after screenshots of the change if applicable.

Checklist

• I have run the black . command to format the code base.
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Dependencies have been updated, if applicable.

[Copilot]

Pull request overview

Adds a consolidated agent/developer reference file (AGENTS.md) and updates CLAUDE.md to point to that new reference, aiming to centralize project conventions for AI tooling.

Changes:

• Added AGENTS.md containing the full “Developer Reference” (project structure, style, contributing, tests).
• Replaced the contents of CLAUDE.md with a single-line pointer to AGENTS.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
CLAUDE.md	Replaced the previous full reference with a single-line pointer to AGENTS.md.
AGENTS.md	New canonical developer/agent reference document containing the previous CLAUDE.md content.

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[Copilot]

@AGENTS.md is not valid Markdown (it renders as plain text) and is unlikely to be interpreted by Claude Code as an include/redirect, which means Claude may no longer load the repository conventions described in CONTRIBUTING.md. Replace this with an explicit pointer like a short sentence and a Markdown link to AGENTS.md (or keep the full conventions in CLAUDE.md if Claude Code requires the content to live there).

Suggested change

	@AGENTS.md
	Please see [AGENTS.md](AGENTS.md) for repository conventions and agent guidelines.