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/content/mod.script.tl

@@ -0,0 +1,9 @@
+local mod = {}
+
+mod.preRunFn = function(_configDict : {{string, string}}, _allModParams : {string : {string : integer}}, baseConfig : BaseConfig)
+
+	baseConfig.trainAccelerationFactor = 0.5
+
+end
+
+return mod