fix: tolerate empty Cordn coordinator tool responses

src/lib/cordn/native/coordinator.ts

@@ -101,6 +101,7 @@ export class CordnCoordinatorClient {
     name: string,
     args: Record<string, unknown>,
     schema: { parse: (value: unknown) => S },
+    empty?: () => S,
   ): Promise<S> {
     await this.connected;
     const result = await this.client.callTool(
@@ -108,7 +109,20 @@ export class CordnCoordinatorClient {
       undefined,
       { onprogress: () => undefined, resetTimeoutOnProgress: true },
     );
-    return schema.parse(result.structuredContent);
+
+    // ContextVM normally returns `structuredContent`, but some coordinator
+    // builds return the JSON in a text content block and omit the structured
+    // field. Accept both; only then fall back to a method-specific empty value.
+    let payload: unknown = result.structuredContent;
+    if (payload === undefined) {
+      const content = result.content as Array<{ type?: string; text?: string }> | undefined;
+      const text = content?.find((item) => item.type === 'text')?.text;
+      if (text) {
+        try { payload = JSON.parse(text); } catch { /* not JSON */ }
+      }
+    }
+    if (payload === undefined && empty) return empty();
+    return schema.parse(payload);
   }
 
   /* ── key packages ───────────────────────────────────────────────────────── */
@@ -122,7 +136,12 @@ export class CordnCoordinatorClient {
   }
 
   async listAvailableKeyPackages(): Promise<ListAvailableKeyPackagesOutput> {
-    return this.call(COORDINATOR_METHODS.listAvailableKeyPackages, {}, listAvailableKeyPackagesOutputSchema);
+    return this.call(
+      COORDINATOR_METHODS.listAvailableKeyPackages,
+      {},
+      listAvailableKeyPackagesOutputSchema,
+      () => ({ keyPackages: [] }),
+    );
   }
 
   async consumeKeyPackage(id: string): Promise<KeyPackage> {
@@ -156,6 +175,7 @@ export class CordnCoordinatorClient {
       COORDINATOR_METHODS.fetchManyGroupMessages,
       { groups },
       fetchManyGroupMessagesOutputSchema,
+      () => ({ messages: [] }),
     );
     return { messages: result.messages.map((m) => groupMessageSchema.parse(m)) as GroupMessage[] };
   }
@@ -167,7 +187,12 @@ export class CordnCoordinatorClient {
   }
 
   async fetchPendingWelcomes(input: FetchPendingWelcomesInput = {}): Promise<FetchPendingWelcomesOutput> {
-    return this.call(COORDINATOR_METHODS.fetchPendingWelcomes, { ...input }, fetchPendingWelcomesOutputSchema);
+    return this.call(
+      COORDINATOR_METHODS.fetchPendingWelcomes,
+      { ...input },
+      fetchPendingWelcomesOutputSchema,
+      () => ({ welcomes: [] }),
+    );
   }
 
   /* ── join requests (ask to be added) ────────────────────────────────────── */