docs: Étape 14 (shadows) finale — bilan DRAFT, ROADMAP §4.2, README roadmap

- docs/DRAFT.md: document vidé (bilan Étape 14 archivé dans l'historique git)
- docs/ROADMAP.md §4.2: Shadows marqué [x] (Étape 14, mono-lumière PCF)
- README.md: item 12 de la roadmap (shadow mapping)
- cargo fmt --all sur les sources Étape 14

lib/src/core/renderer.rs

@@ -27,7 +27,7 @@ use crate::pipeline::{
 };
 use crate::resources::uniform::{FRAME_UNIFORMS_SIZE, OBJECT_UNIFORM_SIZE, SHADOW_UNIFORM_SIZE};
 use crate::resources::{
-    Camera, FrameUniforms, Lights, Material, Mesh, ObjectUniform, ShadowUniform, MAX_LIGHTS,
+    Camera, FrameUniforms, Lights, MAX_LIGHTS, Material, Mesh, ObjectUniform, ShadowUniform,
 };
 use crate::scene::Scene;
 use crate::utils::conf::{
@@ -350,11 +350,9 @@ impl Renderer {
                 -light.position_dir.y,
                 -light.position_dir.z,
             ),
-            crate::resources::LightType::Spot { .. } => Vec3::new(
-                light.dir_angle.x,
-                light.dir_angle.y,
-                light.dir_angle.z,
-            ),
+            crate::resources::LightType::Spot { .. } => {
+                Vec3::new(light.dir_angle.x, light.dir_angle.y, light.dir_angle.z)
+            }
             crate::resources::LightType::Point => return None,
         };
         let r = SHADOW_SCENE_RADIUS;
@@ -371,8 +369,7 @@ impl Renderer {
         // scene-radius behind the target, so the box [−r, r] around the target spans a depth range
         // of [0, 2r] from the eye: `far = 2·r` covers the whole box (and the shadows cast behind
         // it), whereas `far = r` would clip the far half.
-        let proj =
-            glam::camera::rh::proj::directx::orthographic(-r, r, -r, r, 0.0, 2.0 * r);
+        let proj = glam::camera::rh::proj::directx::orthographic(-r, r, -r, r, 0.0, 2.0 * r);
         Some((index, proj * view))
     }
 
@@ -525,8 +522,11 @@ impl Renderer {
             None => return,
         };
         let shadow_uniform = ShadowUniform { view_proj: vp };
-        self.queue
-            .write_buffer(&self.shadow_uniform_buffer, 0, bytemuck::bytes_of(&shadow_uniform));
+        self.queue.write_buffer(
+            &self.shadow_uniform_buffer,
+            0,
+            bytemuck::bytes_of(&shadow_uniform),
+        );
 
         let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
             label: Some("shadow map render pass"),
@@ -654,10 +654,7 @@ fn create_depth_texture(
 /// comparison sampler). Allocated once at the default resolution; resizing is deferred (D8).
 /// Inputs: device (GPU resource creator), size (shadow map edge length in pixels).
 /// Returns the (texture, view) pair; the caller keeps both alive.
-fn create_shadow_map(
-    device: &wgpu::Device,
-    size: u32,
-) -> (wgpu::Texture, wgpu::TextureView) {
+fn create_shadow_map(device: &wgpu::Device, size: u32) -> (wgpu::Texture, wgpu::TextureView) {
     let shadow_texture = device.create_texture(&wgpu::TextureDescriptor {
         label: Some("shadow map"),
         size: wgpu::Extent3d {