feat(simulation): thread world seed from StartupMessage into economy (#826)

Replaces the hardcoded seed=0 with the seed received in StartupMessage,
threading it through SimulationPlugin -> EconomyPlugin / SimRng. Integration
test fixtures updated for the new SimulationPlugin { seed } signature.

server/tests/archetype_monologue.rs

@@ -78,7 +78,7 @@ mod gauntlet_integration {
     /// Build a minimal Gauntlet app with the given archetype and run one tick.
     fn boot_gauntlet(archetype: CharacterArchetype) -> App {
         let mut app = App::new();
-        app.add_plugins(SimulationPlugin);
+        app.add_plugins(SimulationPlugin { seed: 0 });
         test_world::setup_gauntlet(&mut app, archetype);
         app.update();
         app

server/tests/cross_room_transitions.rs

@@ -221,7 +221,7 @@ fn t3_pause_mid_corridor_discards_movement_and_resumes() {
     use settled_reach_server::simulation::SimulationPlugin;
 
     let mut app = App::new();
-    app.add_plugins(SimulationPlugin);
+    app.add_plugins(SimulationPlugin { seed: 0 });
     // 200×200 walkability map covers the full gauntlet coordinate space.
     app.insert_resource(WalkabilityMap::new(200, 200, 1));
 

server/tests/determinism.rs

@@ -38,7 +38,7 @@ use settled_reach_server::simulation::SimulationPlugin;
 /// Snapshots are written to SnapshotBuffer for direct inspection.
 fn build_deterministic_app(seed: u64) -> App {
     let mut app = App::new();
-    app.add_plugins(SimulationPlugin);
+    app.add_plugins(SimulationPlugin { seed });
     app.add_plugins(BridgePlugin);
     app.add_plugins(KnowledgePlugin);
     app.add_plugins(NpcPlugin);

server/tests/error_handling.rs

@@ -46,7 +46,7 @@ fn malformed_input_produces_sim_error_and_server_continues() {
         let bridge = TcpBridge::accept_on(listener).expect("accept connection");
 
         let mut app = App::new();
-        app.add_plugins(SimulationPlugin);
+        app.add_plugins(SimulationPlugin { seed: 0 });
         app.add_plugins(BridgePlugin);
         app.add_plugins(KnowledgePlugin);
         app.init_resource::<TrustEventQueue>();
@@ -177,7 +177,7 @@ fn state_hash_populated_in_snapshot() {
         let bridge = TcpBridge::accept_on(listener).expect("accept connection");
 
         let mut app = App::new();
-        app.add_plugins(SimulationPlugin);
+        app.add_plugins(SimulationPlugin { seed: 0 });
         app.add_plugins(BridgePlugin);
         app.add_plugins(KnowledgePlugin);
         app.init_resource::<TrustEventQueue>();

server/tests/game_loop.rs

@@ -28,7 +28,7 @@ fn player_moves_north_through_full_pipeline() {
 
         // Build app
         let mut app = App::new();
-        app.add_plugins(SimulationPlugin);
+        app.add_plugins(SimulationPlugin { seed: 0 });
         app.add_plugins(BridgePlugin);
         app.add_plugins(KnowledgePlugin);
         app.init_resource::<TrustEventQueue>();

server/tests/gen_gauntlet_fixtures.rs

@@ -39,7 +39,7 @@ const FIXTURE_DIR: &str = "../tests/fixtures/gauntlet";
 /// Identical to what the server runs in --test-mode.
 fn build_gauntlet(seed: u64) -> App {
     let mut app = App::new();
-    app.add_plugins(SimulationPlugin);
+    app.add_plugins(SimulationPlugin { seed: 0 });
     app.add_plugins(BridgePlugin);
     app.add_plugins(KnowledgePlugin);
     app.add_plugins(NpcPlugin);

server/tests/golden_suite.rs

@@ -46,7 +46,7 @@ const NUM_TICKS: usize = 10;
 /// Mirrors the setup in determinism.rs / main.rs.
 fn build_app(seed: u64) -> App {
     let mut app = App::new();
-    app.add_plugins(SimulationPlugin);
+    app.add_plugins(SimulationPlugin { seed: 0 });
     app.add_plugins(BridgePlugin);
     app.add_plugins(KnowledgePlugin);
     app.add_plugins(NpcPlugin);

server/tests/movement.rs

@@ -6,7 +6,7 @@ use settled_reach_server::simulation::SimulationPlugin;
 #[test]
 fn movement_validated_within_app() {
     let mut app = App::new();
-    app.add_plugins(SimulationPlugin);
+    app.add_plugins(SimulationPlugin { seed: 0 });
 
     // Insert a walkability map with one blocked tile
     let mut map = WalkabilityMap::new(10, 10, 1);
@@ -56,7 +56,7 @@ fn movement_validated_within_app() {
 #[test]
 fn entity_collision_blocks_movement() {
     let mut app = App::new();
-    app.add_plugins(SimulationPlugin);
+    app.add_plugins(SimulationPlugin { seed: 0 });
     app.insert_resource(WalkabilityMap::new(10, 10, 1));
 
     // Stationary entity at (5,4)

server/tests/perf_bench.rs

@@ -66,7 +66,7 @@ fn perf_tick_timing() {
         let bridge = TcpBridge::accept_on(listener).expect("accept connection");
 
         let mut app = App::new();
-        app.add_plugins(SimulationPlugin);
+        app.add_plugins(SimulationPlugin { seed: 0 });
         app.add_plugins(BridgePlugin);
         app.add_plugins(settled_reach_server::knowledge::KnowledgePlugin);
         app.add_plugins(settled_reach_server::npc::NpcPlugin);

server/tests/smoke.rs

@@ -7,7 +7,7 @@ use settled_reach_server::simulation::SimulationPlugin;
 #[test]
 fn world_boots_and_ticks() {
     let mut app = App::new();
-    app.add_plugins(SimulationPlugin);
+    app.add_plugins(SimulationPlugin { seed: 0 });
 
     // Verify initial state
     let time = app.world().resource::<SimulationTime>();

server/tests/tell_escalation.rs

@@ -112,7 +112,7 @@ fn build_storyteller_app() -> App {
         bridge::types::CharacterArchetype, simulation::SimulationPlugin, test_world,
     };
     let mut app = App::new();
-    app.add_plugins(SimulationPlugin);
+    app.add_plugins(SimulationPlugin { seed: 0 });
     test_world::setup_gauntlet(&mut app, CharacterArchetype::default());
     app
 }