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/src/simulation/generator.rs

@@ -80,7 +80,7 @@ pub type Season = String;
 pub type RoleSlot = String;
 /// Day phase (morning, afternoon, evening, night, late-night). Stub.
 pub type DayPhase = String;
-/// Triangle template reference (links to content/templates/). Stub.
+/// Triangle template reference (links to server/content/templates/). Stub.
 pub type TriangleTemplate = String;
 /// Raw chunk tile data for generator use (64×64 bool grid, true = walkable). Stub.
 pub type GeneratorChunkData = Vec<bool>;
@@ -559,7 +559,10 @@ mod tests {
             vertical_corridors: vec![],
             hosted_sites: vec![],
         };
-        assert_eq!(r.base_z, -30, "deep mine base_z must be representable as i8");
+        assert_eq!(
+            r.base_z, -30,
+            "deep mine base_z must be representable as i8"
+        );
         assert_eq!(r.z_levels, 30u8, "z_levels count must remain u8");
     }