feat: orchestrate deterministic growth report generation

internal/growthreport/coordinator_test.go

@@ -0,0 +1,29 @@
+package growthreport
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestCoordinatorFallsBackToBoundedProcessCounters(t *testing.T) {
+	t.Parallel()
+	coordinator := NewCoordinator(nil, CoordinatorConfig{CreatePerMinute: 2, UncachedPerDay: 1, DailyRequests: 1, DailyTokens: 1600, MaxConcurrent: 1})
+	now := time.Date(2026, 8, 21, 0, 0, 0, 0, time.UTC)
+	if err := coordinator.AllowCreate(context.Background(), 7, now); err != nil {
+		t.Fatal(err)
+	}
+	if err := coordinator.AllowCreate(context.Background(), 7, now); err != nil {
+		t.Fatal(err)
+	}
+	if err := coordinator.AllowCreate(context.Background(), 7, now); !errors.Is(err, ErrRateLimited) {
+		t.Fatalf("third request error=%v", err)
+	}
+	if err := coordinator.ReserveBudget(context.Background(), 1600, now); err != nil {
+		t.Fatal(err)
+	}
+	if err := coordinator.ReserveBudget(context.Background(), 1, now); !errors.Is(err, ErrBudgetExhausted) {
+		t.Fatalf("second budget error=%v", err)
+	}
+}