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/determinism.rs

@@ -352,13 +352,13 @@ fn gauntlet_deterministic_replay() {
 /// path (select_dialogue_line) which consumes SimRng.
 #[test]
 fn different_seed_produces_different_replay() {
-    use settled_reach_server::simulation::line_pool::{
-        AccessTier, IndexedDialogueLine, IndexedDialoguePool, LinePoolIndex, Mood, Situation,
-        TrustTier, LinePoolIndexResource,
-    };
     use settled_reach_server::simulation::dialogue::{
         CurrentMood, DialogueCooldownTracker, DialogueProfile, DialogueResponseBuffer,
     };
+    use settled_reach_server::simulation::line_pool::{
+        AccessTier, IndexedDialogueLine, IndexedDialoguePool, LinePoolIndex, LinePoolIndexResource,
+        Mood, Situation, TrustTier,
+    };
 
     /// Build a deterministic app with dialogue-capable NPCs.
     fn build_app_with_dialogue(seed: u64) -> App {