- Validate GlobalSettings.language at the write boundary (store.ts) via
validateLocale, so invalid locales are dropped not persisted (api-contract P1).
- Fix detectEnvLocale: Traditional-script env tags (zh_Hant/zh_Hant_TW/zh_HK/
zh_MO) now resolve to zh-TW instead of Simplified; use replaceAll for
multi-underscore POSIX tags (adversarial P2). Add coverage.
- Agent-native parity: add 'language' to the CLI settings allowlist
(VALID_SETTINGS + GLOBAL_ONLY + enum) so 'fn settings set language' works
like the dashboard switcher.
- Document --lang in the bin.ts help table (api-contract P3).
- Derive the expected locale-chunk count from the locales dir instead of a
hardcoded 5 (maintainability), and add prebuild:client so a raw vite build
on a fresh clone still syncs catalogs (adversarial P2).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
f707b62155