- Add "Policy 不能为 None (CRITICAL)" section - Document that sparse_policy must always be at least FullAttentionPolicy - Document warmup phase as the only exception where kvcache_manager can be None Generated with [Claude Code](https://claude.ai/code) via [Happy](https://happy.engineering) Co-Authored-By: Claude <noreply@anthropic.com> Co-Authored-By: Happy <yesreply@happy.engineering>