chore(client): add reasons to expect attributes

crates/client/src/camera.rs

@@ -59,7 +59,10 @@ impl Camera {
     /// Advances the camera by a single frame, applying `input` accumulated over `dt` seconds.
     pub fn update(&mut self, input: &InputState, dt: f32) {
         // Apply accumulated mouse motion to the orientation. A downward mouse delta (positive y) lowers the pitch, so the vertical term is subtracted.
-        #[expect(clippy::cast_possible_truncation)]
+        #[expect(
+            clippy::cast_possible_truncation,
+            reason = "mouse deltas are small; f32 precision is sufficient for camera input"
+        )]
         {
             self.yaw += input.mouse_delta.0 as f32 * self.sensitivity;
             self.pitch -= input.mouse_delta.1 as f32 * self.sensitivity;

crates/client/src/main.rs

@@ -22,8 +22,10 @@ use winit::window::{CursorGrabMode, Window, WindowId};
 /// Transient per-frame input state sampled from window and device events.
 ///
 /// Keyboard fields hold whether a movement key is currently pressed. `mouse_delta` accumulates raw pointer motion between frames and is consumed (reset to zero) once applied to the camera.
-// The bools are independent per-key held states, for which a flat struct is the clearest form.
-#[expect(clippy::struct_excessive_bools)]
+#[expect(
+    clippy::struct_excessive_bools,
+    reason = "per-key held states are independent; a flat bool struct is the clearest representation"
+)]
 #[derive(Default)]
 struct InputState {
     /// Whether the "move forward" key (W) is held.
@@ -141,10 +143,16 @@ impl ApplicationHandler for App {
         self.window = Some(window);
         self.renderer = Some(renderer);
 
-        #[expect(clippy::expect_used)]
+        #[expect(
+            clippy::expect_used,
+            reason = "startup asset load; a missing worldgen config is unrecoverable at launch"
+        )]
         let config_str = std::fs::read_to_string("assets/data/worldgen/default.json")
             .expect("Failed to read worldgen config");
-        #[expect(clippy::expect_used)]
+        #[expect(
+            clippy::expect_used,
+            reason = "startup config parse; a malformed worldgen config is unrecoverable at launch"
+        )]
         let worldgen_config: shared::generator::WorldGenConfig =
             serde_json::from_str(&config_str).expect("Failed to parse worldgen config");
 
@@ -160,7 +168,10 @@ impl ApplicationHandler for App {
             indices.len()
         );
 
-        #[expect(clippy::expect_used)]
+        #[expect(
+            clippy::expect_used,
+            reason = "the renderer is assigned earlier in this function"
+        )]
         self.renderer
             .as_mut()
             .expect("Renderer initialized")

crates/client/src/meshing.rs

@@ -6,7 +6,8 @@ use shared::world::{BlockId, CHUNK_SIZE, Chunk};
 #[expect(
     clippy::cast_precision_loss,
     clippy::cast_possible_truncation,
-    clippy::too_many_lines
+    clippy::too_many_lines,
+    reason = "voxel coordinates and vertex counts are small and lossless as f32/u32; the per-face unrolling is intentionally long"
 )]
 pub fn generate_mesh(chunk: &Chunk) -> (Vec<Vertex>, Vec<u32>) {
     let mut vertices = Vec::new();