feat(config): gate channel config writes

src/config/types.msteams.ts

@@ -34,6 +34,8 @@ export type MSTeamsConfig = {
   enabled?: boolean;
   /** Optional provider capability tags used for agent/runtime guidance. */
   capabilities?: string[];
+  /** Allow channel-initiated config writes (default: true). */
+  configWrites?: boolean;
   /** Azure Bot App ID (from Azure Bot registration). */
   appId?: string;
   /** Azure Bot App Password / Client Secret. */