Add plugin telemetry bridge capability

Expose telemetry.track through the plugin SDK and server host bridge, forward plugin-prefixed events into the shared telemetry client, and demonstrate the capability in the kitchen sink example.\n\nCo-Authored-By: Paperclip <noreply@paperclip.ing>

packages/plugins/sdk/src/testing.ts

@@ -71,6 +71,7 @@ export interface TestHarness {
   logs: TestHarnessLogEntry[];
   activity: Array<{ message: string; entityType?: string; entityId?: string; metadata?: Record<string, unknown> }>;
   metrics: Array<{ name: string; value: number; tags?: Record<string, string> }>;
+  telemetry: Array<{ eventName: string; dimensions?: Record<string, string | number | boolean> }>;
 }
 
 type EventRegistration = {
@@ -132,6 +133,7 @@ export function createTestHarness(options: TestHarnessOptions): TestHarness {
   const logs: TestHarnessLogEntry[] = [];
   const activity: TestHarness["activity"] = [];
   const metrics: TestHarness["metrics"] = [];
+  const telemetry: TestHarness["telemetry"] = [];
 
   const state = new Map<string, unknown>();
   const entities = new Map<string, PluginEntityRecord>();
@@ -631,6 +633,12 @@ export function createTestHarness(options: TestHarnessOptions): TestHarness {
         metrics.push({ name, value, tags });
       },
     },
+    telemetry: {
+      async track(eventName, dimensions) {
+        requireCapability(manifest, capabilitySet, "telemetry.track");
+        telemetry.push({ eventName, dimensions });
+      },
+    },
     logger: {
       info(message, meta) {
         logs.push({ level: "info", message, meta });
@@ -729,6 +737,7 @@ export function createTestHarness(options: TestHarnessOptions): TestHarness {
     logs,
     activity,
     metrics,
+    telemetry,
   };
 
   return harness;