feat(core): Étape 11 — resize (surface + depth, Phase 4.4)

lib/src/core/renderer.rs

@@ -167,6 +167,23 @@ impl Renderer {
         self.write_default_frame_uniforms();
     }
 
+    /// Recreates the depth texture at a new size, used on window resize (ROADMAP Phase 4.4).
+    /// The previous depth texture is dropped when its field is replaced — no leak, no double
+    /// allocation. The helper `create_depth_texture` (Étape 9, D3) is reused so the recreate stays
+    /// trivial. Inputs: width/height — the new surface dimensions in pixels.
+    pub fn resize_depth(&mut self, width: u32, height: u32) {
+        let (depth_texture, depth_view) = create_depth_texture(&self.device, width, height);
+        self._depth_texture = depth_texture;
+        self.depth_view = depth_view;
+    }
+
+    /// Updates the stored surface texture format after a surface reconfigure (ROADMAP Phase 4.4).
+    /// Used when `Context::configure` returns a different format so the Renderer stays in sync
+    /// with the surface. Inputs: format — the new surface texture format.
+    pub fn set_format(&mut self, format: wgpu::TextureFormat) {
+        self.format = format;
+    }
+
     /// Rewrites the shared per-frame uniform buffer from the scene's active camera and the current
     /// viewport aspect, then returns the frame bind group wired to that buffer. Called at the start of
     /// every `render_scene` so the GPU sees the latest camera matrices and camera position (Étape 4.3).