Try to fix badly encoded json tex commands from the flash-lite calls

tests/test_statement_personal_flow.py

@@ -134,6 +134,42 @@ class SelectiveGeminiTests(unittest.TestCase):
                 gemini.refine_existing(self.workspace, "persp", api_client=self.client)
             self.assertEqual(self.snapshot(), before)
 
+    def test_rubric_latex_and_line_breaks_survive_json_and_file_writes(self):
+        expected = (
+            r'Barème : $f \circ g \rightarrow \frac{1}{2} \not= 0$.'
+            '\n' + r'$\begin{matrix}a & b \\ c & d\end{matrix}$, $\theta$, $\beta$, $\nu$.'
+            '\nUne "justification" vaut 1 point.'
+        )
+        self.client.models.generate_content.side_effect = [
+            self.response({'rubrics': [{'label': label, 'rubric_content': expected} for label in group]})
+            for group in (self.labels[:2], self.labels[2:])
+        ]
+        gemini.refine_existing(self.workspace, 'persp', api_client=self.client)
+        for label in self.labels:
+            self.assertEqual((self.root / 'Persp' / label).read_bytes(),
+                             (label + '\n' + expected).encode('utf-8'))
+
+    def test_invalid_latex_escapes_are_repaired_without_retry(self):
+        for command in (r'\circ', r'\rightarrow', r'\frac', r'\not', r'\theta', r'\beta'):
+            with self.subTest(command=command):
+                # Deliberately malformed wire JSON: do not json.dumps the command.
+                broken = SimpleNamespace(text='{"rubrics":[{"label":"Ex 2","rubric_content":"$'
+                                         + command + '$"}]}')
+                self.client.models.generate_content.reset_mock()
+                self.client.models.generate_content.side_effect = [broken]
+                self.assertEqual(gemini.generate_rubrics(self.client, 'context'),
+                                 {'Ex 2': '$' + command + '$'})
+                self.assertEqual(self.client.models.generate_content.call_count, 1)
+
+    def test_unrepairable_control_character_preserves_all_existing_rubrics(self):
+        before = self.snapshot()
+        broken = self.response({'rubrics': [{'label': 'Ex 2', 'rubric_content': 'invalid \x01 control'}]})
+        self.client.models.generate_content.side_effect = [
+            self.rubric_response(self.labels[:2]), broken]
+        with self.assertRaisesRegex(ValueError, 'control characters'):
+            gemini.refine_existing(self.workspace, 'persp', api_client=self.client)
+        self.assertEqual(self.snapshot(), before)
+
     def test_cli_dispatches_selective_modes_without_full_extraction(self):
         with patch.object(gemini, "refine_existing", return_value=ExitCode.SUCCESS) as refine, patch.object(
             gemini, "process_exam"