rng fix

src/entities/tasks/executor.rs

@@ -16,12 +16,13 @@ use crate::entities::tasks::idle::execute_idle;
 use crate::world::tiles::tilemap::TileMap;
 use bevy::prelude::*;
 use bevy_rand::prelude::*;
+use rand::{RngExt, SeedableRng};
 
 /// Main task executor. Runs in FixedUpdate.
 pub fn task_executor_system(
     mut commands: Commands,
     tilemap: Res<TileMap>,
-    mut rng_q: Query<&mut WyRand, With<GlobalRng>>,
+    time: Res<Time>,
     mut query: Query<(
         Entity,
         &mut TaskQueue,
@@ -33,12 +34,15 @@ pub fn task_executor_system(
     mut completed_writer: MessageWriter<TaskCompleted>,
     mut failed_writer: MessageWriter<TaskFailed>,
 ) {
-    // Get mutable access to the single GlobalRng entity
-    // This must be done once per frame, not per entity
-    let mut rng = match rng_q.single_mut() {
-        Ok(r) => r,
-        Err(_) => return, // No GlobalRng entity exists yet
-    };
+    // Create a deterministic RNG from global SEED + time
+    // This mirrors the forestry.rs pattern - no dependency on bevy_rand plugin
+    use std::collections::hash_map::DefaultHasher;
+    use std::hash::{Hash, Hasher};
+    let mut hasher = DefaultHasher::new();
+    crate::constants::SEED.hash(&mut hasher);
+    time.elapsed_secs().to_bits().hash(&mut hasher);
+    let seed = hasher.finish();
+    let mut rng = WyRand::seed_from_u64(seed);
 
     for (entity, mut queue, mut state, mut ambulatory, transform) in query.iter_mut() {
         // If queue empty, assign default Idle task