chore: scaffold repository and record 0.1.0 setup state

Create Game/, Art/, Geo/, Tools/, Docs/ with LFS and ignore rules, record the
workstation audit, toolchain pins, setup checklist, release checks, and
licensing policy. ROADMAP 0.1.0 environment tasks marked to match verified state.

.gitignore

@@ -0,0 +1,38 @@
+# Unreal Engine generated output — never commit
+Binaries/
+DerivedDataCache/
+Intermediate/
+Saved/
+Build/Receipts/
+*.VC.db
+*.VC.opendb
+*.opensdf
+*.sdf
+*.suo
+*.sln
+*.xcodeproj/
+*.xcworkspace/
+.vs/
+
+# Engine installations are external to this repository
+/Engine/
+/UnrealEngine*/
+
+# Blender backups and temp
+*.blend1
+*.blend2
+
+# Python tooling
+__pycache__/
+*.py[cod]
+.venv/
+venv/
+.pytest_cache/
+.ruff_cache/
+
+# Editors and OS
+.idea/
+.vscode/
+.DS_Store
+Thumbs.db
+*~