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/npc/tolerance.rs

@@ -239,7 +239,10 @@ mod tests {
         run_system(&mut world);
 
         let queue = world.resource::<ToleranceBreachEventQueue>();
-        assert!(queue.is_empty(), "stress=49 < threshold=50 should not breach");
+        assert!(
+            queue.is_empty(),
+            "stress=49 < threshold=50 should not breach"
+        );
     }
 
     #[test]
@@ -402,8 +405,7 @@ mod tests {
         // Should not crash — query requires ToleranceThreshold, so entity is simply skipped
         let mut world = setup_world();
         world.spawn((
-            Npc,
-            ActiveSim,
+            Npc, ActiveSim,
             // No ToleranceThreshold component
         ));
 
@@ -529,7 +531,10 @@ mod tests {
         run_system(&mut world);
 
         let queue = world.resource::<ToleranceBreachEventQueue>();
-        assert!(queue.is_empty(), "stress=99 < threshold=100 should not breach");
+        assert!(
+            queue.is_empty(),
+            "stress=99 < threshold=100 should not breach"
+        );
     }
 
     #[test]