Add credential-free cloud build diagnostic

app.py

@@ -0,0 +1,24 @@
+"""Credential-free probe for the owner's ModelHub cloud deployment."""
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+import json
+import os
+
+metadata = {"name": "xc-cloud-build-probe", "version": "probe-20261026-01",
+    "strategyIdPresent": bool(os.environ.get("STRATEGY_ID")),
+    "credentialEnvironmentNames": sorted(name for name in os.environ
+        if any(marker in name for marker in ("TOKEN", "AUTH", "CREDENTIAL", "SECRET", "API_KEY")))}
+print(json.dumps(metadata), flush=True)
+
+
+class Handler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        data = {"status": "ok"} if self.path.split("?", 1)[0] == "/health" else metadata
+        payload = json.dumps(data).encode()
+        self.send_response(200)
+        self.send_header("Content-Type", "application/json")
+        self.send_header("Content-Length", str(len(payload)))
+        self.end_headers()
+        self.wfile.write(payload)
+
+
+ThreadingHTTPServer(("0.0.0.0", 8080), Handler).serve_forever()