feat(mod): add hello-world script mod

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

mod/mod.json

@@ -0,0 +1,13 @@
+{
+    "modId": "haylan_tf3_overtake",
+    "revision": 1,
+    "severityAdd": "None",
+    "severityRemove": "Warning",
+    "cosmetic": false,
+    "preRunScript": {
+        "fileName": "haylan_tf3_overtake::mod.script@preRunFn"
+    },
+    "postRunScript": {
+        "fileName": "haylan_tf3_overtake::mod.script@postRunFn"
+    }
+}