New doc-sync gate verify-website-yaml: each ```yaml block under
website/zh-CN (api/ excluded — generator-owned) must parse with the loader's
real schema (JSON_SCHEMA + !!js), use only EntryOptions keys, name only real
workspace packages, and pass only config keys the plugin's declared Config
type / schemastery schema accepts (collectConfigCatalog drives the key sets).
```yaml ignore-check opts out a deliberate-placeholder block (the
capability-trio tutorial keeps its fictional package names).