Implemented a validation step to confirm that grammatical changes do not change substantive meaning

tests/test_prompts.py

@@ -1,7 +1,11 @@
 import json
 
 from audita.chunking import chunk_transcript
-from audita.prompts import build_glossary_correction_messages, build_grammar_correction_messages
+from audita.prompts import (
+    build_glossary_correction_messages,
+    build_grammar_correction_messages,
+    build_grammar_validation_messages,
+)
 from audita.schemas import parse_glossary_yaml, parse_transcript_json
 
 
@@ -169,3 +173,27 @@ def test_grammar_prompt_uses_simplified_segment_payload():
     assert "speaker" not in prompt_segments[0]
     assert "start" not in prompt_segments[0]
     assert "end" not in prompt_segments[0]
+
+
+def test_grammar_validation_prompt_rejects_semantic_changes():
+    messages = build_grammar_validation_messages(
+        [
+            {
+                "correction_index": 0,
+                "id": 1,
+                "original_segment_text": "He became visible.",
+                "corrected_segment_text": "He became invisible.",
+                "original_text": "visible",
+                "corrected_text": "invisible",
+            }
+        ]
+    )
+    prompt_text = "\n".join(message["content"] for message in messages)
+
+    assert "preserves meaning" in prompt_text
+    assert "became visible" in prompt_text
+    assert "became invisible" in prompt_text
+    assert "reverses the meaning" in prompt_text
+    assert "spelling and homophone fixes only when" in prompt_text
+    assert "correction_index" in prompt_text
+    assert "is_meaning_preserving" in prompt_text