fix(examples): add missing registerAppTool and registerAppResource imports

All example servers were using registerAppTool and registerAppResource
but not importing them from @modelcontextprotocol/ext-apps/server,
causing "ReferenceError: registerAppTool is not defined" at runtime.

Affected servers:
- budget-allocator-server
- cohort-heatmap-server
- customer-segmentation-server
- scenario-modeler-server
- system-monitor-server
- threejs-server
- wiki-explorer-server

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ochafik

examples/budget-allocator-server/server.ts

@@ -16,6 +16,8 @@ import { z } from "zod";
 import {
   RESOURCE_MIME_TYPE,
   RESOURCE_URI_META_KEY,
+  registerAppResource,
+  registerAppTool,
 } from "@modelcontextprotocol/ext-apps/server";
 import { startServer } from "../shared/server-utils.js";
 

examples/cohort-heatmap-server/server.ts

@@ -7,6 +7,8 @@ import { z } from "zod";
 import {
   RESOURCE_MIME_TYPE,
   RESOURCE_URI_META_KEY,
+  registerAppResource,
+  registerAppTool,
 } from "@modelcontextprotocol/ext-apps/server";
 import { startServer } from "../shared/server-utils.js";
 

examples/customer-segmentation-server/server.ts

@@ -10,6 +10,8 @@ import { z } from "zod";
 import {
   RESOURCE_MIME_TYPE,
   RESOURCE_URI_META_KEY,
+  registerAppResource,
+  registerAppTool,
 } from "@modelcontextprotocol/ext-apps/server";
 import { startServer } from "../shared/server-utils.js";
 import {

examples/scenario-modeler-server/server.ts

@@ -10,6 +10,8 @@ import { z } from "zod";
 import {
   RESOURCE_MIME_TYPE,
   RESOURCE_URI_META_KEY,
+  registerAppResource,
+  registerAppTool,
 } from "@modelcontextprotocol/ext-apps/server";
 import { startServer } from "../shared/server-utils.js";
 

examples/system-monitor-server/server.ts

@@ -12,6 +12,8 @@ import { z } from "zod";
 import {
   RESOURCE_MIME_TYPE,
   RESOURCE_URI_META_KEY,
+  registerAppResource,
+  registerAppTool,
 } from "@modelcontextprotocol/ext-apps/server";
 import { startServer } from "../shared/server-utils.js";
 

examples/threejs-server/server.ts

@@ -12,6 +12,8 @@ import { z } from "zod";
 import {
   RESOURCE_MIME_TYPE,
   RESOURCE_URI_META_KEY,
+  registerAppResource,
+  registerAppTool,
 } from "@modelcontextprotocol/ext-apps/server";
 import { startServer } from "../shared/server-utils.js";
 

examples/wiki-explorer-server/server.ts

@@ -11,6 +11,8 @@ import { z } from "zod";
 import {
   RESOURCE_MIME_TYPE,
   RESOURCE_URI_META_KEY,
+  registerAppResource,
+  registerAppTool,
 } from "@modelcontextprotocol/ext-apps/server";
 import { startServer } from "../shared/server-utils.js";