refactor(server): apply rustfmt and clippy suggestions

Formatting pass across simulation, perception, knowledge, NPC, and
test modules. Includes two clippy fixes in monologue.rs (.values()
instead of for (_, v) pattern).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/perception/shadowcast.rs

@@ -101,7 +101,12 @@ pub fn symmetric_shadowcast(
     visible.insert((origin_x, origin_y)); // Origin is always visible
 
     // Process 4 cardinal quadrants
-    for &cardinal in &[Cardinal::North, Cardinal::East, Cardinal::South, Cardinal::West] {
+    for &cardinal in &[
+        Cardinal::North,
+        Cardinal::East,
+        Cardinal::South,
+        Cardinal::West,
+    ] {
         scan_quadrant(&mut visible, is_opaque, origin_x, origin_y, range, cardinal);
     }