Enhanced Save System

crates/energy/src/electromagnetism/fields.rs

@@ -88,7 +88,9 @@ impl MagneticField {
 
         // Biot-Savart law: dB = (μ₀/4π) * (I dl × r̂) / r²
         let field_magnitude = MAGNETIC_CONSTANT_DIV_4PI * current / (distance * distance);
-        let field = Vec2::new(-r_unit.y, r_unit.x) * current_direction.length() * field_magnitude;
+        let field = Vec2::new(-r_unit.y, r_unit.x)
+            * (current_direction.x * r_unit.y - current_direction.y * r_unit.x)
+            * field_magnitude;
 
         Self::new(field, field_position)
     }

crates/systems/ai/src/core/actions.rs

@@ -8,7 +8,7 @@ use std::sync::Arc;
 /// of the Thinker that spawned it, and the actual Action system executing the
 /// Action itself.
 #[derive(Debug, Clone, Component, Eq, PartialEq, Reflect)]
-#[component(storage = "SparseSet")]
+#[component(storage = "Table")]
 pub enum ActionState {
     /// Initial state. No action should be performed.
     Init,

crates/systems/ai/src/drives/mod.rs

@@ -7,7 +7,9 @@ use bevy::prelude::*;
 pub struct DrivesPlugin;
 
 impl Plugin for DrivesPlugin {
-    fn build(&self, _app: &mut App) {
+    fn build(&self, app: &mut App) {
+        app.register_type::<needs::Need>()
+            .register_type::<needs::NeedType>();
         // Simple plugin - just makes drives available
         // Systems will be added later when we have proper integration
     }

crates/systems/ai/src/drives/needs.rs

@@ -2,7 +2,7 @@ use crate::prelude::*;
 use bevy::prelude::*;
 
 /// Core need types representing basic drives
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Reflect)]
 pub enum NeedType {
     Hunger, // Need for nourishment
     Safety, // Need to avoid danger
@@ -11,7 +11,7 @@ pub enum NeedType {
 }
 
 /// Component representing a single need
-#[derive(Component, Debug, Clone)]
+#[derive(Component, Debug, Clone, Reflect)]
 pub struct Need {
     /// Type of need
     pub need_type: NeedType,

crates/systems/save_system/src/lib.rs

@@ -3,20 +3,29 @@ use bevy::prelude::*;
 pub mod save_system;
 pub mod versioning;
 
-/// Plugin for save/load functionality with versioning support
-#[derive(Default)]
 pub struct SaveSystemPlugin;
 
 impl Plugin for SaveSystemPlugin {
-    fn build(&self, _app: &mut App) {
-        // TODO: Will add save/load systems when needed
-        // For now, just register the plugin
+    fn build(&self, app: &mut App) {
+        app.init_resource::<save_system::GameTracker>()
+            .register_type::<save_system::Saveable>()
+            .register_type::<save_system::GameState>()
+            .register_type::<save_system::GameEvent>()
+            .register_type::<save_system::SaveMetadata>();
+    }
+}
+
+impl Default for SaveSystemPlugin {
+    fn default() -> Self {
+        Self
     }
 }
 
-/// Prelude for easy importing
 pub mod prelude {
     pub use super::SaveSystemPlugin;
-    pub use crate::save_system::{load, save};
+    pub use crate::save_system::{
+        get_save_directory, get_save_path, load, load_game_data, save, save_game_data, GameEvent,
+        GameSaveData, GameSnapshot, GameState, GameTracker, SaveMetadata, Saveable, WorldSaveExt,
+    };
     pub use crate::versioning::{is_save_up_to_date, upgrade_save, SAVE_VERSION};
 }