feat: use @computesdk/secure-exec-nodejs, add probeCommand flag

Replace custom provider with the computesdk package import.
Add per-provider probeCommand to override the default 'node -v' TTI probe.

Author: NathanFlurry

package-lock.json

@@ -42,6 +42,7 @@
     "@computesdk/runloop": "^1.3.36",
     "@computesdk/sprites": "^0.1.1",
     "@computesdk/vercel": "^1.7.13",
+    "@computesdk/secure-exec-nodejs": "file:../computesdk/packages/secure-exec-nodejs",
     "computesdk": "^2.2.1",
     "dotenv": "^17.2.1",
     "secure-exec": "0.1.1-rc.3"