feat: add Pi conversation worker pool

electron/coding-runtime/pi/telemetry.ts

@@ -0,0 +1,55 @@
+export const PI_RUNTIME_MILESTONES = [
+  'worker.queue_wait',
+  'worker.spawn',
+  'rpc.ready',
+  'session.open',
+  'resources.ready',
+  'prompt.accepted',
+] as const;
+
+export type PiRuntimeMilestone = (typeof PI_RUNTIME_MILESTONES)[number];
+
+export interface PiRuntimeTelemetryEvent {
+  milestone: PiRuntimeMilestone;
+  conversationRef: string;
+  workerGeneration: number;
+  spanId: string;
+  runRef?: string;
+  cold: boolean;
+  durationMs: number;
+  at: number;
+}
+
+export interface PiRuntimeMilestoneInput {
+  milestone: PiRuntimeMilestone;
+  conversationId: string;
+  workerGeneration: number;
+  runId?: string;
+  cold: boolean;
+  durationMs: number;
+  at: number;
+}
+
+function shortRef(value: string): string {
+  const normalized = value.replace(/[^A-Za-z0-9]/g, '');
+  return normalized.slice(-8).toLowerCase() || 'unknown';
+}
+
+export function createPiRuntimeTelemetryEvent(
+  input: PiRuntimeMilestoneInput,
+): PiRuntimeTelemetryEvent {
+  const conversationRef = shortRef(input.conversationId);
+  const runRef = input.runId ? shortRef(input.runId) : undefined;
+  return {
+    milestone: input.milestone,
+    conversationRef,
+    workerGeneration: input.workerGeneration,
+    spanId: runRef
+      ? `${conversationRef}:${runRef}`
+      : `${conversationRef}:worker-${input.workerGeneration}`,
+    ...(runRef ? { runRef } : {}),
+    cold: input.cold,
+    durationMs: Math.max(0, Math.round(input.durationMs)),
+    at: input.at,
+  };
+}