Keep IM tool approvals in chat and add WhatsApp default model.

Claim in-flight IM turns before ownership flips active so approvals no longer stick only in DSH Web, auto-recover stale session models once, and let WhatsApp bots pick a shared default model for new sessions.

Co-authored-by: Cursor <cursoragent@cursor.com>

plugin-src/host/channels/shared/default-model-rpc.mjs

@@ -0,0 +1,27 @@
+import { normalizeDefaultModel } from '../../../../src/channels/shared/default-model.mjs';
+
+export const SET_DEFAULT_MODEL_ENDPOINT = 'bot.model.set';
+
+function isRecord(value) {
+  return value !== null && typeof value === 'object' && !Array.isArray(value);
+}
+
+export function validDefaultModelPayload(payload) {
+  if (!isRecord(payload)
+    || !Object.keys(payload).every((key) => ['botId', 'defaultModel'].includes(key))
+    || typeof payload.botId !== 'string'
+    || !/^[A-Za-z0-9_-]{1,128}$/.test(payload.botId)) {
+    return false;
+  }
+  if (payload.defaultModel === null) return true;
+  return Boolean(normalizeDefaultModel(payload.defaultModel));
+}
+
+export function publicDefaultModelError(error) {
+  if (![
+    'default-model-invalid',
+    'default-model-unavailable',
+    'workspace-bot-not-found',
+  ].includes(error?.code)) return null;
+  return { code: error.code, message: error.message };
+}