refactor: transition to struct-of-arrays ECS architecture

- Replace individual Entity structs with centralized component slices in Game struct (SoA layout).
- Implement bitmask-based component lookup (CM_Position, CM_Move, etc.).
- Convert logic from object-oriented Update() methods to standalone Systems (UpdateMoveSystem, UpdateGatherSystem, UpdateSpawnSystem).
- Update rendering, selection, and input handling to iterate over component arrays.

1 files changed, 10 insertions, 0 deletions

diff --git a/monad/monad.go b/monad/monad.go
new file mode 100644
index 0000000..43fb241
--- /dev/null
+++ b/monad/monad.go
@@ -0,0 +1,10 @@
+package monad
+
+type Option[T any] struct {
+	Ok    bool
+	Value T
+}
+
+func Some[T any](value T) Option[T] {
+	return Option[T]{Ok: true, Value: value}
+}