feat(simulation): add debug console server and LOS boundary wall margin

Debug and LOS tracks for Sprint 23 (#580, #584):

- DebugCommandKind enum with 10 variants (AdvanceTicks,
  SkipToContamination, TeleportToPosition, ForceContaminationActivate,
  InspectNpc, ListTriangles, ListPopulation, GetContaminationStatus,
  TeleportToLocation, ForceTriangleActivation)
- DebugResponsePayload on ObserverSnapshot, handle_debug_commands
  system gated by DebugEnabled resource
- PROTOCOL_VERSION bumped 17 → 18
- VisibilitySector::BoundaryWall variant — 1-tile wall margin beyond
  LOS boundary included in visible_tiles (not exploration/memory)
- compute_boundary_walls() pass in NaturalVision after FOV+cone

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

server/src/simulation/input.rs

@@ -2,6 +2,7 @@
 // Timestamped player input events for deterministic simulation (D-010 principle 4)
 // PlayerInput: semantic actions (MoveNorth, Interact, UsePerceptionMode, ToggleStance)
 
+use crate::bridge::debug::DebugCommandBuffer;
 use crate::bridge::types::{FacingDirection, ObjectType, PlayerAction, PlayerInput};
 use crate::knowledge::{EntityRegistry, StableId};
 use crate::perception::vision_cone::{facing_from_delta, Facing};
@@ -98,6 +99,7 @@ pub fn process_player_input(
     reset_triggers: Query<&RoomResetTrigger>,
     mut room_snapshots: Option<ResMut<RoomSnapshots>>,
     mut save_load: Option<ResMut<SaveLoadPending>>,
+    mut debug_cmd_buffer: Option<ResMut<DebugCommandBuffer>>,
     door_states: Query<&DoorState>,
     object_types: Query<&ObjectType>,
 ) {
@@ -119,6 +121,7 @@ pub fn process_player_input(
                     | PlayerAction::TeleportToHub
                     | PlayerAction::SaveGame { .. }
                     | PlayerAction::LoadGame { .. }
+                    | PlayerAction::DebugCommand(_)
             )
         {
             continue;
@@ -364,6 +367,13 @@ pub fn process_player_input(
                     tracing::warn!("LoadGame received but SaveLoadPending resource not registered");
                 }
             }
+            PlayerAction::DebugCommand(cmd) => {
+                if let Some(ref mut buf) = debug_cmd_buffer {
+                    buf.push(cmd);
+                } else {
+                    tracing::warn!("DebugCommand received but DebugCommandBuffer not registered");
+                }
+            }
         }
     }