docs: CLAUDE.md website section — zh-CN is a site locale since the i18n expansion (#226)

The Locales snippet still showed locales: ['en', 'es'] while
website/docusaurus.config.ts ships ['en', 'es', 'zh-CN'] and
https://straymark.dev/zh-CN/ is live. Also marks docs/ as EN + ES + zh-CN
in the project tree. Stale instructions induced a wrong "zh-CN is not a
website locale" claim during the fw-4.23.0 docs verification.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: montfort

CLAUDE.md

@@ -29,7 +29,7 @@ straymark/
 │   ├── .straymark/          # Templates, governance, config
 │   ├── STRAYMARK.md         # Unified governance rules
 │   └── dist-manifest.yml   # What gets installed
-├── docs/                   # Project documentation (EN + ES)
+├── docs/                   # Project documentation (EN + ES + zh-CN)
 ├── .github/workflows/      # CI/CD
 │   ├── release-cli.yml     # Build + release CLI binaries
 │   └── release-framework.yml
@@ -326,10 +326,11 @@ Configured in `docusaurus.config.ts` under `i18n`:
 ```ts
 i18n: {
   defaultLocale: 'en',
-  locales: ['en', 'es'],
+  locales: ['en', 'es', 'zh-CN'],
   localeConfigs: {
     en: {label: 'English'},
     es: {label: 'Español'},
+    'zh-CN': {label: '简体中文'},
   },
 }
 ```