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/serialization.rs

@@ -404,7 +404,7 @@ fn all_facing_direction_variants_roundtrip() {
             conversation_events: vec![],
             conversation_ended: vec![],
             follow_state: None,
-        character_pressure: None,
+            character_pressure: None,
             rng_seed: None,
             poi_list: vec![],
             examine_result: None,
@@ -412,7 +412,7 @@ fn all_facing_direction_variants_roundtrip() {
             save_result: None,
             triangle_crisis_events: vec![],
             state_hash: None,
-        debug_response: None,
+            debug_response: None,
             sim_errors: vec![],
             current_ticker: None,
             settings_response: None,
@@ -1706,8 +1706,7 @@ fn fixture_snapshot_minimal_fields() {
 #[test]
 fn fixture_snapshot_full_fields() {
     let bytes = read_named_fixture("snapshot_full");
-    let snap: ObserverSnapshot =
-        rmp_serde::from_slice(&bytes).expect("deserialize snapshot_full");
+    let snap: ObserverSnapshot = rmp_serde::from_slice(&bytes).expect("deserialize snapshot_full");
 
     assert_eq!(snap.version, PROTOCOL_VERSION, "protocol version mismatch");
     assert_eq!(snap.tick, 42, "tick should be 42");
@@ -1715,10 +1714,7 @@ fn fixture_snapshot_full_fields() {
     // Monologue
     let monologue = snap.current_monologue.as_ref().expect("monologue absent");
     assert_eq!(monologue.id, "test_monologue_001");
-    assert_eq!(
-        monologue.text,
-        "Something feels off about this place."
-    );
+    assert_eq!(monologue.text, "Something feels off about this place.");
 
     // Dialogue
     let dialogue = snap.dialogue_response.as_ref().expect("dialogue absent");
@@ -1738,7 +1734,10 @@ fn fixture_snapshot_full_fields() {
     assert_eq!(examine.entity_id, 42);
 
     // Player knowledge
-    let kg = snap.player_knowledge.as_ref().expect("player_knowledge absent");
+    let kg = snap
+        .player_knowledge
+        .as_ref()
+        .expect("player_knowledge absent");
     assert_eq!(kg.entities.len(), 1);
     assert_eq!(kg.entities[0].name, "Kael");
     assert_eq!(kg.facts.len(), 1);
@@ -1758,8 +1757,7 @@ fn fixture_snapshot_full_fields() {
 #[test]
 fn fixture_player_input_move_fields() {
     let bytes = read_named_fixture("player_input_move");
-    let input: PlayerInput =
-        rmp_serde::from_slice(&bytes).expect("deserialize player_input_move");
+    let input: PlayerInput = rmp_serde::from_slice(&bytes).expect("deserialize player_input_move");
 
     assert_eq!(input.tick, 1, "tick should be 1");
     assert!(
@@ -1780,7 +1778,11 @@ fn fixture_player_input_interact_fields() {
             target_entity_id,
             verb,
         } => {
-            assert_eq!(*target_entity_id, Some(99u64), "target_entity_id should be Some(99)");
+            assert_eq!(
+                *target_entity_id,
+                Some(99u64),
+                "target_entity_id should be Some(99)"
+            );
             assert_eq!(
                 verb.as_deref(),
                 Some("Talk"),