diff --git a/xcom-ultra/xcu-labyrinth/src/lib.rs b/xcom-ultra/xcu-labyrinth/src/lib.rs
index 7131153..64b4856 100644
--- a/xcom-ultra/xcu-labyrinth/src/lib.rs
+++ b/xcom-ultra/xcu-labyrinth/src/lib.rs
@@ -75,6 +75,13 @@ impl Labyrinth {
 
     /// Select route through the labyrinth
     pub fn build_route(&mut self, source: &str, destination: &str) -> Result<Vec<String>, LabyrinthError> {
+        // Pre-compute random values before borrowing self.nodes
+        let hop_rand = self.next_random();
+        let node_count = self.nodes.len();
+        let rand_scores: Vec<f64> = (0..node_count)
+            .map(|_| (self.next_random() % 100) as f64 * 0.3)
+            .collect();
+
         let eligible: Vec<&LabyrinthNode> = self.nodes.values()
             .filter(|n| n.is_alive)
             .filter(|n| !self.avoid_countries.contains(&n.country))
@@ -85,15 +92,16 @@ impl Labyrinth {
             return Err(LabyrinthError::NoRoute(format!("Need {} hops, only {} nodes", self.min_hops, eligible.len())));
         }
 
-        let hop_count = self.min_hops + (self.next_random() as usize % (self.max_hops - self.min_hops + 1));
+        let hop_count = self.min_hops + (hop_rand as usize % (self.max_hops - self.min_hops + 1));
         let hop_count = hop_count.min(eligible.len());
 
         // Score nodes: prefer high trust, low latency, diverse countries
-        let mut scored: Vec<(&LabyrinthNode, f64)> = eligible.iter().map(|n| {
+        let mut scored: Vec<(&LabyrinthNode, f64)> = eligible.iter().enumerate().map(|(i, n)| {
+            let rand_component = rand_scores.get(i).copied().unwrap_or(0.0);
             let score = n.trust_score * 50.0
                 + (1000.0 / (n.latency_ms as f64 + 1.0))
                 + n.bandwidth_mbps as f64 * 0.1
-                + (self.next_random() % 100) as f64 * 0.3; // randomness
+                + rand_component;
             (*n, score)
         }).collect();
 
diff --git a/xcom-ultra/xcu-ouroboros/src/lib.rs b/xcom-ultra/xcu-ouroboros/src/lib.rs
index 19e08bf..4c43d5f 100644
--- a/xcom-ultra/xcu-ouroboros/src/lib.rs
+++ b/xcom-ultra/xcu-ouroboros/src/lib.rs
@@ -2,7 +2,6 @@
 #![allow(dead_code)]
 //! [TSM.ID].[11031972] -- Platform X Ecosystem
 //! xcu-ouroboros -- Self-updating Binary Manager with OTA & Integrity
-use std::collections::HashMap;
 
 #[derive(Debug)]
 pub enum OuroborosError { VersionConflict(String), IntegrityFailed(String), RollbackFailed(String) }
diff --git a/xcom-ultra/xcu-qcg-wasm/src/lib.rs b/xcom-ultra/xcu-qcg-wasm/src/lib.rs
index 0f5596b..ea12639 100644
--- a/xcom-ultra/xcu-qcg-wasm/src/lib.rs
+++ b/xcom-ultra/xcu-qcg-wasm/src/lib.rs
@@ -5,7 +5,6 @@
 //! JIT-compile & execute WASM bytecode with sandboxed memory
 
 use std::collections::HashMap;
-use std::sync::{Arc, Mutex};
 
 #[derive(Debug)]
 pub enum WasmError { CompileFailed(String), RuntimeError(String), MemoryError(String), LinkError(String) }
diff --git a/xcom-ultra/xcu-rpc/src/lib.rs b/xcom-ultra/xcu-rpc/src/lib.rs
index 9bff6a1..7fca271 100644
--- a/xcom-ultra/xcu-rpc/src/lib.rs
+++ b/xcom-ultra/xcu-rpc/src/lib.rs
@@ -27,7 +27,7 @@ pub struct RpcFrame {
     pub error: Option<String>,
 }
 
-const MAGIC: [u8; 2] = [0xXC, 0xU1]; // XCU magic
+const MAGIC: [u8; 2] = [0xC0, 0x01]; // XCU magic bytes
 
 impl RpcFrame {
     pub fn request(id: u32, method: &str, params: Vec<RpcValue>) -> Self {
diff --git a/xcom-ultra/xcu-thread-weaver/src/lib.rs b/xcom-ultra/xcu-thread-weaver/src/lib.rs
index db3af5c..40f28f2 100644
--- a/xcom-ultra/xcu-thread-weaver/src/lib.rs
+++ b/xcom-ultra/xcu-thread-weaver/src/lib.rs
@@ -76,7 +76,7 @@ impl ThreadWeaver {
 
     /// Get queue stats
     pub fn stats(&self) -> Vec<(usize, u64, u64)> {
-        self.queues.iter().enumerate().map(|(i, q)| {
+        self.queues.iter().enumerate().map(|(_i, q)| {
             if let Ok(q) = q.lock() { (q.len(), q.processed, q.stolen_from) }
             else { (0, 0, 0) }
         }).collect()
diff --git a/xcom-ultra/xcu-tui/src/lib.rs b/xcom-ultra/xcu-tui/src/lib.rs
index fb72f02..6de09b7 100644
--- a/xcom-ultra/xcu-tui/src/lib.rs
+++ b/xcom-ultra/xcu-tui/src/lib.rs
@@ -2,7 +2,6 @@
 #![allow(dead_code)]
 //! [TSM.ID].[11031972] -- Platform X Ecosystem
 //! xcu-tui -- Terminal Dashboard for System Monitoring
-use std::collections::HashMap;
 use std::fmt::Write;
 
 #[derive(Debug)]
diff --git a/xcom-ultra/xcu-watermark/src/lib.rs b/xcom-ultra/xcu-watermark/src/lib.rs
index 37c7ef7..3e5443a 100644
--- a/xcom-ultra/xcu-watermark/src/lib.rs
+++ b/xcom-ultra/xcu-watermark/src/lib.rs
@@ -38,7 +38,7 @@ impl WatermarkEncoder {
         }
         Ok(result)
     }
-    pub fn verify(original: &[u8], watermarked: &[u8], data: &[u8], strength: EmbedStrength) -> bool {
+    pub fn verify(_original: &[u8], watermarked: &[u8], data: &[u8], strength: EmbedStrength) -> bool {
         let extracted = Self::extract(watermarked, data.len(), strength);
         match extracted { Ok(ext) => ext == data, Err(_) => false }
     }