Introduce a Chinese-language project guide at AGENTS.md (cross-tool
standard read by Cursor/Aider/Copilot CLI) covering build commands,
required sibling repos, plugin architecture, the ID-switch entity
registration pattern, persistence layers, lifecycle hooks, scheduled
jobs, and project conventions. CLAUDE.md is a short pointer to
AGENTS.md so the two stay in sync without duplicate maintenance.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
