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/src/test_world/constants.rs

@@ -205,11 +205,7 @@ pub const CONFRONTATION_STAGE: GauntletRoom = GauntletRoom {
 /// distances from the observer: Close (2 tiles), Medium (6 tiles), Long (12 tiles).
 pub const SOUND_LAB: GauntletRoom = GauntletRoom {
     name: "sound_lab",
-    origin: TilePosition {
-        x: 0,
-        y: 104,
-        z: 0,
-    },
+    origin: TilePosition { x: 0, y: 104, z: 0 },
     size: (34, 20),
     spawn: TilePosition {
         x: 10,