fix(simulation): Clippy cleanup and CI enforcement (#635)

Fix all Clippy warnings across the server codebase (2411 insertions, 1341
deletions). Raise type-complexity-threshold to 750 and too-many-arguments
to 12 in .clippy.toml for idiomatic Bevy ECS system signatures. The server
now passes `cargo clippy -- --deny warnings` cleanly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/tests/fuzzy_map.rs

@@ -79,9 +79,9 @@ fn generate_map(seed: u64) -> ProceduralMap {
         let y: i32 = rng.random_range(2_i32..(MAP_H - h - 2));
 
         // Reject if overlaps an existing room (1-tile padding).
-        let overlaps = rooms.iter().any(|r| {
-            x < r.x + r.w + 1 && x + w + 1 > r.x && y < r.y + r.h + 1 && y + h + 1 > r.y
-        });
+        let overlaps = rooms
+            .iter()
+            .any(|r| x < r.x + r.w + 1 && x + w + 1 > r.x && y < r.y + r.h + 1 && y + h + 1 > r.y);
 
         if !overlaps {
             for ry in y..(y + h) {
@@ -153,11 +153,8 @@ fn generate_map(seed: u64) -> ProceduralMap {
     }
 
     // Player start: centre of first room (always walkable by construction).
-    let player_start = TilePosition::new(
-        rooms[0].x + rooms[0].w / 2,
-        rooms[0].y + rooms[0].h / 2,
-        0,
-    );
+    let player_start =
+        TilePosition::new(rooms[0].x + rooms[0].w / 2, rooms[0].y + rooms[0].h / 2, 0);
 
     let mut entities = vec![player_start];
     entities.extend(door_placements.iter().map(|d| d.pos));