Checkpoint first-party source parser pilot

tools/healthcheck-source-plugin.js

@@ -0,0 +1,5 @@
+'use strict';
+
+fetch('http://127.0.0.1:8094/health', { signal: AbortSignal.timeout(3000) })
+  .then(response => { if (!response.ok) process.exitCode = 1; })
+  .catch(() => { process.exitCode = 1; });