fix(server): guard paseo:ready IPC behind PASEO_SUPERVISED env var

The process.send check alone was insufficient because vitest also runs
workers with IPC channels. Now the supervisor sets PASEO_SUPERVISED=1
on the worker env, and bootstrap checks for it before sending.

packages/server/src/server/bootstrap.ts

@@ -691,7 +691,7 @@ export async function createPaseoDaemon(
               );
             }
 
-            if (typeof process.send === "function") {
+            if (typeof process.send === "function" && process.env.PASEO_SUPERVISED === "1") {
               process.send({
                 type: "paseo:ready",
                 listen: