Refactor render graph error handling and resource APIs

- RenderGraph.Compile/Execute now return Error for better failure detection; error handling is propagated throughout compiler and executor.
- Renamed ScheduleReleaseResource to ReleaseResource for clarity; updated all usages.
- ResourceManager now calls ReleaseResource directly on Mesh, Material, and Shader types.
- Camera exposes Actual/Virtual size properties and Render returns Error.
- RenderingContext now uses IResourceManager for mesh/resource ops.
- Replaced custom BinaryWriter with BufferWriter in RenderGraphHasher.
- Improved variable naming, interface signatures, and code formatting.
- Added Error extension for IsSuccess/IsFailure.
- Minor FMOD/native interop and test code cleanups.
- No breaking API changes except for new Error return values on some methods.

src/Runtime/Ghost.Entities/System.cs

@@ -204,7 +204,7 @@ public abstract class SystemGroup : ISystem
         foreach (var sys in systems)
         {
             var type = sys.GetType();
-            if (!dependencies.TryGetValue(type, out HashSet<Type>? value))
+            if (!dependencies.TryGetValue(type, out var value))
             {
                 value = [];
                 dependencies[type] = value;
@@ -234,7 +234,7 @@ public abstract class SystemGroup : ISystem
         // We loop until we have sorted everyone
         while (sortedList.Count < systems.Count)
         {
-            bool addedAny = false;
+            var addedAny = false;
 
             foreach (var sys in systems)
             {
@@ -242,7 +242,7 @@ public abstract class SystemGroup : ISystem
                 if (visited.Contains(type)) continue;
 
                 // Check if all dependencies for this system are already visited/sorted
-                bool canRun = true;
+                var canRun = true;
                 if (dependencies.TryGetValue(type, out var deps))
                 {
                     foreach (var dep in deps)