fix: resolve swarm_sim compile errors (unused imports, unused mut) (#28)

- Remove unused Bernoulli import in agent.rs
- Remove unused Mutex, SignalDirection, Conviction imports in engine.rs
- Remove unused MarketState import in scenario.rs
- Remove unnecessary mut on config in digital_twin.rs

Author: Ashutosh0x

crates/swarm_sim/src/agent.rs

@@ -1,5 +1,5 @@
 use rand::Rng;
-use rand_distr::{Distribution, Normal, Bernoulli};
+use rand_distr::{Distribution, Normal};
 use serde::{Deserialize, Serialize};
 use std::collections::VecDeque;
 

crates/swarm_sim/src/digital_twin.rs

@@ -49,7 +49,7 @@ pub struct DigitalTwin {
 impl DigitalTwin {
     /// Spawn 100k agents optimised for the large-scale regime
     pub fn new_large_scale(symbol: &str, initial_price: f64) -> Self {
-        let mut config = SwarmConfig {
+        let config = SwarmConfig {
             agent_count: 100_000,
             retail_fraction: 0.65,
             hedge_fund_fraction: 0.08,

crates/swarm_sim/src/engine.rs

@@ -6,14 +6,14 @@ use rand::SeedableRng;
 use rand::rngs::SmallRng;
 use serde::{Deserialize, Serialize};
 use tokio::sync::broadcast;
-use tokio::sync::Mutex;
+
 use tracing::{debug, info, warn};
 
 use crate::agent::{Agent, AgentAction, AgentId, TraderType};
 use crate::config::SwarmConfig;
 use crate::market::MarketState;
 use crate::persistence::ActionLog;
-use crate::signal::{SwarmSignal, SignalDirection, Conviction};
+use crate::signal::SwarmSignal;
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct SwarmStep {

crates/swarm_sim/src/scenario.rs

@@ -2,7 +2,6 @@ use serde::{Deserialize, Serialize};
 use tracing::info;
 
 use crate::engine::SwarmEngine;
-use crate::market::MarketState;
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum MarketScenario {