Add runtime abstraction and agent loop

Co-authored-by: codegirl007 <codegirl-007@users.noreply.github.com>

agentbox/internal/agent/deterministic_test.go

@@ -0,0 +1,33 @@
+package agent
+
+import (
+	"context"
+	"testing"
+
+	"agentbox/internal/environment"
+)
+
+func TestDeterministicSequence(t *testing.T) {
+	controller := &Deterministic{}
+	want := []struct {
+		action environment.InputType
+		done   bool
+	}{
+		{environment.KeyDown, false},
+		{environment.Wait, false},
+		{environment.KeyUp, false},
+		{"", true},
+	}
+	for index, expected := range want {
+		decision, err := controller.NextAction(context.Background(), "", nil, Observation{})
+		if err != nil {
+			t.Fatalf("step %d: %v", index, err)
+		}
+		if decision.Done != expected.done {
+			t.Fatalf("step %d done = %v, want %v", index, decision.Done, expected.done)
+		}
+		if expected.action != "" && (decision.Action == nil || decision.Action.Type != expected.action) {
+			t.Fatalf("step %d action = %#v, want %s", index, decision.Action, expected.action)
+		}
+	}
+}