chore: point CLAUDE.md to AGENTS.md

[julien51]

Moves agent guidance to AGENTS.md (the cross-tool convention) so it works for all models/tools, not just Claude Code.

• AGENTS.md already exists and holds the full guidance (identical to the old CLAUDE.md).
• CLAUDE.md is now a thin pointer that imports AGENTS.md via Claude Code's @AGENTS.md syntax, so Claude Code still loads the full guidance.\n\n🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
relay-sdk-demo	Ready	Preview, Comment	Jun 1, 2026 8:51pm

[github-actions]

Claude finished @julien51's task in 39s —— View job

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Code Review

No issues found.

Reviewed 1 file, 110 lines changed (3 added / 107 removed). Verified that AGENTS.md exists at the repo root and contains the full guidance previously in CLAUDE.md, and that the new CLAUDE.md uses Claude Code's @AGENTS.md import syntax so the full content is still loaded for Claude Code while other tools can read AGENTS.md directly.

Checked correctness (pointer file uses valid @<path> import syntax), no security/error-handling surface, and repo-specific guidelines compliance (documentation-only, no code changes).
• Branch: chore/migrate-claude-md-to-agents-md

[github-actions]

Claude finished @julien51's task in 27s —— View job

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📝 Docs Drift Check — No docs impact

This PR does not touch surfaces that require a relayprotocol/relay-docs update.

[github-actions]

Claude finished @julien51's task in 42s —— View job

---

Code Review

No issues found.

Reviewed 1 file, 110 lines changed (3 added / 107 removed).

Verified:

• AGENTS.md exists at the repo root with the full guidance identical to the old CLAUDE.md content (no drift between the two).
• New CLAUDE.md uses Claude Code's @AGENTS.md import syntax, so Claude Code still loads the full guidance, while other tools (Cursor, Aider, Codex, etc.) read AGENTS.md directly via the cross-tool convention.
• Documentation-only change — no code, security, or error-handling surface.
• No repo-specific guideline violations (ABOUTME convention does not apply to Markdown docs).
  • Branch: chore/migrate-claude-md-to-agents-md

[github-actions]

Claude finished @julien51's task in 13s —— View job

---

📝 Docs Drift Check — No docs impact

This PR does not touch surfaces that require a relayprotocol/relay-docs update.