feat(simulation): add vision cone with forward/peripheral/blind sectors (#111)

Implement direction-dependent visibility modulation per D-015.
Forward cone (~120 deg) at full range, peripheral (~180 deg each side)
at reduced range, blind spot (~60 deg behind) excluded. Facing component
updated on player movement via facing_from_delta.

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

server/src/main.rs

@@ -6,6 +6,7 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 
 use settled_reach_server::bridge::tcp::TcpBridge;
 use settled_reach_server::bridge::{BridgePlugin, BridgeResource, ServerRunning};
+use settled_reach_server::perception::vision_cone::Facing;
 use settled_reach_server::simulation::movement::{PlayerCharacter, TilePosition, WalkabilityMap};
 use settled_reach_server::simulation::SimulationPlugin;
 
@@ -40,7 +41,7 @@ fn main() {
     app.insert_resource(BridgeResource::new(bridge));
     app.insert_resource(WalkabilityMap::new(32, 32, 1));
     app.world_mut()
-        .spawn((PlayerCharacter, TilePosition::new(16, 16, 0)));
+        .spawn((PlayerCharacter, TilePosition::new(16, 16, 0), Facing::default()));
 
     tracing::info!("Simulation initialized, entering game loop");