fix: correct GetProperty bug, init to use .ax/, add default aliases, split e2e tests, add due date tests

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/e2e_init_test.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestInit(t *testing.T) {
+	t.Run("CreatesDatabase", func(t *testing.T) {
+		env := &testEnv{t: t, dir: t.TempDir(), user: "testuser"}
+		env.mustAx("init")
+		if _, err := os.Stat(filepath.Join(env.dir, ".ax", "ax.db")); err != nil {
+			t.Fatal(".ax/ax.db not created")
+		}
+	})
+
+	t.Run("FailsIfAlreadyExists", func(t *testing.T) {
+		env := newTestEnv(t, "testuser")
+		_, err := env.ax("init")
+		if err == nil {
+			t.Fatal("expected error re-initialising existing DB, got none")
+		}
+	})
+}