Document Codex and Claude Code contribution support

[yuecideng]

Description

This PR updates CONTRIBUTING.md to document the AI coding agents supported by EmbodiChain.

• States that both OpenAI Codex and Claude Code are supported.
• Simplifies setup instructions to official guides and start commands.
• Explains how AGENTS.md and CLAUDE.md share project instructions.
• Documents agent_context/MAP.yaml topic routing and shared project skills.

The previous section only covered Claude Code and duplicated detailed workflow guidance. This focused section now reflects the current shared agent infrastructure.

Dependencies: None.
Related issue: None.

Type of change

• Documentation update

Screenshots

Not applicable.

Validation

• black --check --diff --color ./ (passed; 656 files unchanged)
• black . (passed; 656 files unchanged)
• git diff --check (passed)
• Local Markdown link targets (passed)
• Python tests were not run because no executable code changed.
• Sphinx was not built because CONTRIBUTING.md is outside docs/source and no documentation tooling changed.

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. Not applicable for this documentation-only change.
• Dependencies have been updated, if applicable. No dependency changes were required.

[greptile-apps]

Greptile Summary

Updates the contribution guide to document shared support for OpenAI Codex and Claude Code.

• Adds official setup links and startup commands for both agents.
• Explains shared instructions through AGENTS.md and CLAUDE.md.
• Documents topic routing through agent_context/MAP.yaml.
• Lists the canonical project skills and Claude Code adapters.

Confidence Score: 5/5

The documentation-only change appears safe to merge.

The documented instruction files, context registry, canonical skills, Claude adapters, and named commands are consistent with the repository tree, and no actionable defects were identified.

Important Files Changed

Filename	Overview
CONTRIBUTING.md	Replaces the detailed Claude-only section with concise, accurate guidance for the repository’s shared Codex and Claude Code infrastructure.

_{Reviews (1): Last reviewed commit: "docs(contributing): document AI agent su..." | Re-trigger Greptile}