feat(simulation): ban HashMap via clippy disallowed_types, fix violations (#343)

Adds server/.clippy.toml with disallowed-types for std::collections::HashMap
and std::collections::HashSet. HashMap iteration order is non-deterministic
and breaks deterministic simulation replay (D-030).

Changes:
- server/.clippy.toml: disallow HashMap and HashSet crate-wide
- simulation/movement.rs: WalkabilityMap.chunks and occupied map → BTreeMap;
  add PartialOrd+Ord to ChunkCoord, TilePosition, TilePresence
- simulation/monologue.rs: MonologueState.shown_ids → BTreeSet (simulation state)
- perception/shadowcast.rs: #![allow] — per-frame FOV scratch, iteration irrelevant
- perception/interpretation.rs: #![allow] — per-frame lookup table, key-only access
- perception/query.rs: #![allow] — sector_lookup is a per-frame read-only cache

Also applies cargo fmt to pre-existing format drift in contraband.rs,
dialogue.rs, test_world/mod.rs, and several integration tests.

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

server/src/simulation/monologue.rs

@@ -8,7 +8,7 @@
 // When sprinting past a Contradicted entity, a delayed "double-take" monologue
 // fires retroactively. Detection in observer pipeline, processing here.
 
-use std::collections::HashSet;
+use std::collections::BTreeSet;
 
 use bevy_ecs::prelude::*;
 use rand::Rng;
@@ -77,7 +77,7 @@ pub struct MonologueState {
     /// Whether the enter_location monologue has fired this session.
     pub entered: bool,
     /// IDs of lines already shown (dedup within session).
-    pub shown_ids: HashSet<String>,
+    pub shown_ids: BTreeSet<String>,
     /// Character type for pool filtering. v0.1: always "detective".
     pub character: String,
 }
@@ -89,7 +89,7 @@ impl Default for MonologueState {
             last_position: None,
             idle_ticks: 0,
             entered: false,
-            shown_ids: HashSet::new(),
+            shown_ids: BTreeSet::new(),
             // v0.1: default to detective; character selection sets this
             character: "detective".to_string(),
         }