refactor: share sender-scoped group policy derivation

src/plugin-sdk/matrix.ts

@@ -93,6 +93,7 @@ export {
 } from "../security/dm-policy-shared.js";
 export { formatDocsLink } from "../terminal/links.js";
 export type { WizardPrompter } from "../wizard/prompts.js";
+export { resolveSenderScopedGroupPolicy } from "./group-access.js";
 export { createScopedPairingAccess } from "./pairing-access.js";
 export { formatResolvedUnresolvedNote } from "./resolution-notes.js";
 export { runPluginCommandWithTimeout } from "./run-command.js";