added import tracing in register.js for diagnostic runs

docs/import-trace.md

@@ -0,0 +1,9 @@
+# DTP Import Trace
+
+As a useful tool for diagnosing circular dependencies, you can enable log tracing of imports at runtime by editing [register.js](../register.js) and un-commenting:
+
+```js
+// register("./es-import-trace.js", pathToFileURL("./"));
+```
+
+This will load the [es-import-trace.js](../es-import-trace.js) "loader" which prints the URL of the module being imported, then returns the result of the default loader.

es-import-trace.js

@@ -0,0 +1,10 @@
+// es-import-trace.js
+// Copyright (C) 2025 DTP Technologies, LLC
+// All Rights Reserved
+
+"use strict";
+
+export const load = async (url, context, defaultLoad) => {
+  console.log("import: " + url);
+  return await defaultLoad(url, context);
+};

register.js

@@ -17,4 +17,5 @@
 import { register } from "node:module";
 import { pathToFileURL } from "node:url";
 
+// register("./es-import-trace.js", pathToFileURL("./"));
 register("ts-node/esm", pathToFileURL("./"));