6ffea1bc3 added i18n with en/zh locales and plugin config support, but
the initI18n() call lived in the original src/index.ts. When src/index.ts
became an 18-line wrapper that delegates to
src/testing/create-plugin-module.ts createPluginModule(), the call site
was dropped on the floor. Result: i18n.locale config and LANG env both
ignored at runtime, every toast stayed English regardless of user
setting.
Inject initI18n as a managed dependency and call it in
createPluginModule() immediately after loadPluginConfig(), passing
pluginConfig.i18n?.locale through. Add an integration test that boots
the plugin with i18n.locale='zh' and asserts getLocale() returns 'zh'
and t('toast.task_completed') returns the Chinese string. Regression
locked - subsequent moves of the startup path will fail loudly.
createPluginModule and PluginModuleDeps were exposed at package entry as
a test seam. Their export creates accidental public TS API obligations
for internal manager/tool/hook constructor types. Move to
src/testing/create-plugin-module.ts so only tests reach them.
Closes HIGH-8
Co-authored-by: api-surface (deep / gpt-5.3-codex high)
YeonGyu-Kim