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/perf_bench.rs

@@ -15,12 +15,12 @@ use settled_reach_server::bridge::framing::{read_framed, write_framed};
 use settled_reach_server::bridge::tcp::TcpBridge;
 use settled_reach_server::bridge::types::*;
 use settled_reach_server::bridge::{BridgePlugin, BridgeResource};
-use settled_reach_server::simulation::line_pool::{LinePoolIndex, LinePoolIndexResource};
 use settled_reach_server::knowledge::registry::EntityRegistry;
 use settled_reach_server::knowledge::KnowledgeGraph;
 use settled_reach_server::perception::cognitive_delay::CognitiveDelay;
 use settled_reach_server::perception::vision_cone::Facing;
 use settled_reach_server::simulation::interaction::NearbyInteractionBuffer;
+use settled_reach_server::simulation::line_pool::{LinePoolIndex, LinePoolIndexResource};
 use settled_reach_server::simulation::listening::ListeningFocus;
 use settled_reach_server::simulation::monologue::{
     MonologueBuffer, MonologueState, SprintAnomalyQueue,
@@ -33,7 +33,6 @@ const WARMUP_TICKS: usize = 5;
 const MEASURE_TICKS: usize = 50;
 const TOTAL_TICKS: usize = WARMUP_TICKS + MEASURE_TICKS;
 
-
 fn read_rss_kb() -> Option<u64> {
     std::fs::read_to_string("/proc/self/status")
         .ok()