fix: align and shorten tutorial introduction paragraphs

tools/test_tutorial_intro.py

@@ -0,0 +1,34 @@
+"""Replay tutorial introduction through the deployed engine's layout routine."""
+import json
+from pathlib import Path
+import unittest
+from script_text import patch_display_calls
+from test_cjk_layout import layout
+
+
+class IntroTests(unittest.TestCase):
+    def test_intro_paragraphs_are_left_aligned_without_orphan_punctuation(self):
+        mapping = json.loads(Path(__file__).with_name('tutorial_cn.json').read_text(encoding='utf-8'))
+        intros = [v for k, v in mapping.items() if k.startswith('\fNow')]
+        self.assertEqual(len(intros), 2)
+        for intro in intros:
+            for width in (360, 400, 480):
+                lines, _ = layout(intro, width=width, alignment=0)
+                for raw, x, y in lines:
+                    self.assertEqual(x, 0)
+                    self.assertNotIn(raw.decode('gb2312')[0], '，。！？、；：”）')
+                self.assertEqual(len(lines), 4)
+
+    def test_alignment_override_is_explicit_and_preserves_newlines(self):
+        source = b'SetMissionDescription("\\fA\\n\\aB");'
+        mapping = {'\fA\n\aB': '\bA\n\bB'}
+        with self.assertRaises(ValueError):
+            patch_display_calls(source, mapping)
+        self.assertEqual(patch_display_calls(source, mapping, allow_alignment_changes=True),
+                         b'SetMissionDescription("\\bA\\n\\bB");')
+        with self.assertRaises(ValueError):
+            patch_display_calls(source, {'\fA\n\aB': '\bA\bB'}, allow_alignment_changes=True)
+
+
+if __name__ == '__main__':
+    unittest.main()