chore: add agent-skills config, glossary and example mod

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.examples/ug_tf3_example_config_change/_metadata/modinfo.json

@@ -0,0 +1,15 @@
+{
+    "authors": [
+        {
+            "name": "Urban Games",
+            "role": "CREATOR"
+        }
+    ],
+    "description": "Simple config change mod",
+    "summary": "Example config change",
+    "name": "Example Base Config Change",
+    "tags": [
+        "script"
+    ],
+    "url": ""
+}