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/middleware/error-handler.ts

@@ -1,6 +1,8 @@
 import type { Request, Response, NextFunction } from "express";
 import { ZodError } from "zod";
 import { HttpError } from "../errors.js";
+import { trackErrorHandlerCrash } from "@paperclipai/shared/telemetry";
+import { getTelemetryClient } from "../telemetry.js";
 
 export interface ErrorContext {
   error: { message: string; stack?: string; name?: string; details?: unknown; raw?: unknown };
@@ -44,6 +46,8 @@ export function errorHandler(
         { message: err.message, stack: err.stack, name: err.name, details: err.details },
         err,
       );
+      const tc = getTelemetryClient();
+      if (tc) trackErrorHandlerCrash(tc, { errorName: err.name, route: req.route?.path ?? req.path, method: req.method });
     }
     res.status(err.status).json({
       error: err.message,
@@ -67,5 +71,8 @@ export function errorHandler(
     rootError,
   );
 
+  const tc = getTelemetryClient();
+  if (tc) trackErrorHandlerCrash(tc, { errorName: rootError.name, route: req.route?.path ?? req.path, method: req.method });
+
   res.status(500).json({ error: "Internal server error" });
 }