feat: implement app-side telemetry sender

Add the shared telemetry sender, wire the CLI/server emit points,
and cover the config and completion behavior with tests.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/index.ts

@@ -39,6 +39,7 @@ import { createStorageServiceFromConfig } from "./storage/index.js";
 import { printStartupBanner } from "./startup-banner.js";
 import { getBoardClaimWarningUrl, initializeBoardClaimChallenge } from "./board-claim.js";
 import { maybePersistWorktreeRuntimePorts } from "./worktree-config.js";
+import { initTelemetry } from "./telemetry.js";
 
 type BetterAuthSessionUser = {
   id: string;
@@ -79,6 +80,7 @@ export interface StartedServer {
 
 export async function startServer(): Promise<StartedServer> {
   let config = loadConfig();
+  initTelemetry({ enabled: config.telemetryEnabled });
   if (process.env.PAPERCLIP_SECRETS_PROVIDER === undefined) {
     process.env.PAPERCLIP_SECRETS_PROVIDER = config.secretsProvider;
   }