refactor: tighten project structure and strengthen tooling

docs/user/features.md

@@ -1,3 +1,44 @@
-# Features
+# Implemented Features
 
-TODO: Documenter les fonctionnalités du jeu.
+This document lists features that are actually implemented in the current codebase.
+
+## Scene Preview
+
+- Fullscreen React Three Fiber scene
+- Blocking map loaded from `public/models/map/blocking/model.glb`
+- Ambient and directional lighting
+- Solid background environment color
+
+## Camera Modes
+
+- Player camera mode
+  - eye height at `1.75m`
+  - pointer lock mouse look
+  - movement with `ZQSD`
+  - vertical clamp to prevent falling below the map plane
+- Debug camera mode
+  - free orbit camera
+  - switchable from the debug panel
+
+## UI
+
+- Center-screen crosshair shown only in player mode
+
+## Debug Tooling
+
+- `?debug` query param enables the debug panel
+- `lil-gui` panel with camera mode selection
+- debug lighting controls
+- debug scene helpers
+- `r3f-perf` overlay
+
+## Not Implemented Yet
+
+- missions
+- interactions on `E`
+- gameplay zones
+- cinematics
+- audio systems
+- loading flow
+- minimap and mission HUD
+- collisions beyond the current simple player height clamp