better faulty encoding detection

copienator/commands/correction.py

@@ -21,6 +21,7 @@ from copienator.commands import grouping
 from copienator.answer_origins import save_origins
 from copienator import prompting
 from copienator.feedback_boxes import valid_feedback_box
+from copienator.latex_json import repair_latex_json
 from copienator import (
     CliError,
     EvaluationWorkspace,
@@ -100,6 +101,16 @@ def report_group_progress(completed: int, total: int) -> None:
     )
 
 
+def parse_correction_response(response_text: str):
+    """Decode model JSON without consuming known LaTeX command prefixes."""
+    return json.loads(
+        repair_latex_json(
+            response_text,
+            additional_content_fields={"text"},
+        )
+    )
+
+
 def request_graceful_stop(_signum=None, _frame=None) -> None:
     """Stop scheduling Gemini calls while allowing in-flight calls to finish."""
     if not stop_requested.is_set():
@@ -319,7 +330,7 @@ def correct_boxes_with_gemini(pid, label, pdf_path, original_feedbacks,
 
     contents, config = prompting.request_for_box_correction(pdf_path, original_feedbacks)
     response_text = call_gemini_with_retries(MODEL_ID_flash, contents, config)
-    corrected_feedbacks = json.loads(response_text)
+    corrected_feedbacks = parse_correction_response(response_text)
 
     global_feedbacks = [f for f in original_feedbacks if not f["box_2d"]]
 
@@ -507,7 +518,7 @@ def process_single_task(task_tuple, precomputed_response=None):
                 tprint(f"Asking Gemini {'Flash' if use_flash else 'Pro  '}: {label} {group_name}")
                 full_response_text = call_gemini_with_retries(model_to_use, contents, config)
 
-            json_data = json.loads(full_response_text)
+            json_data = parse_correction_response(full_response_text)
 
             # Ensure consistency of answer placements
             for p in json_data: