fix(simulation): address PR #37 review — doc corrections, race fix, marker cleanup

Hoshe review (4 items):
- types.rs: doc comment "Current: 6" → "Current: 9"
- dialogue.rs: walk-away doc duplicated numbering (items 4-5 were 2-3)
- test_world/mod.rs: comment "Reset plates at 49-51" → "49-55"
- content_scaling.rs: magic number 51 → constants::RESET_PLATE_STABLE_IDS.1

Tyre review (3 items):
- knowledge/types.rs: guard comments on decrement() floor at Hostile
- input.rs: TeleportToHub now clears ConfrontationDelivered marker
- content_scaling.rs: same magic number fix (covered above)

Additional:
- content_runtime.rs: barrier-based shutdown handshake fixes TCP RST
  race condition under parallel test execution
- dialogue_room.rs: clippy type_complexity allow on NPCS tuple array

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

server/src/test_world/mod.rs

@@ -414,7 +414,7 @@ mod tests {
             assert!(registry.to_entity(&StableId(id)).is_some(), "Crowd Plaza at StableId {}", id);
         }
 
-        // Reset plates at 49-51
+        // Reset plates at 49-55
         for id in constants::RESET_PLATE_STABLE_IDS.0..=constants::RESET_PLATE_STABLE_IDS.1 {
             assert!(
                 registry.to_entity(&StableId(id)).is_some(),

server/src/test_world/rooms/dialogue_room.rs

@@ -28,6 +28,7 @@ const ORIGIN_X: i32 = 36;
 const ORIGIN_Y: i32 = 104;
 
 /// NPC definitions: (name, rel_x, rel_y, want_kind, intensity, contentment, stress, threshold, location, role).
+#[allow(clippy::type_complexity)]
 const NPCS: &[(&str, i32, i32, WantKind, u8, i16, i16, i16, &str, &str)] = &[
     (
         "npc_dialogue_a", 8, 8, WantKind::Connection, 4, 20, 10, 60,