fix(trigger): mark cpu-features external to fix deploy build (#5185)

ssh2 became reachable from the trigger background bundle via the Pi
local SSH backend (#5178). esbuild then tried to bundle ssh2's optional
native dep cpu-features and failed on the missing .node binary. ssh2
requires cpu-features inside a try/catch, so externalizing it is safe.

apps/sim/trigger.config.ts

@@ -56,7 +56,7 @@ export default defineConfig({
   dirs: ['./background'],
   ...(grafanaTelemetry ? { telemetry: grafanaTelemetry } : {}),
   build: {
-    external: ['isolated-vm', '@earendil-works/pi-coding-agent'],
+    external: ['isolated-vm', '@earendil-works/pi-coding-agent', 'cpu-features'],
     extensions: [
       additionalFiles({
         files: [