refactor: share trimmed list normalization in provider helpers

src/plugin-sdk/matrix.ts

@@ -92,6 +92,7 @@ export {
   resolveDmGroupAccessWithLists,
 } from "../security/dm-policy-shared.js";
 export { formatDocsLink } from "../terminal/links.js";
+export { normalizeStringEntries } from "../shared/string-normalization.js";
 export type { WizardPrompter } from "../wizard/prompts.js";
 export {
   evaluateGroupRouteAccessForPolicy,

src/plugin-sdk/msteams.ts

@@ -117,3 +117,4 @@ export {
   buildRuntimeAccountStatusSnapshot,
   createDefaultChannelRuntimeState,
 } from "./status-helpers.js";
+export { normalizeStringEntries } from "../shared/string-normalization.js";