fix: Update version to 0.9.4 in uv.lock; improve CI checks and code clarity in AGENTS.md, filename_extractor.py, and mediainfo_extractor.py

AGENTS.md

@@ -647,7 +647,12 @@ except (LookupError, ValueError, AttributeError) as e:
 
 1. **Read Before Modify**: Always read files before suggesting modifications
 2. **Follow Existing Patterns**: Understand established architecture before changes
-3. **Test Everything**: Run `uv run pytest` after all changes
+3. **Run CI Checks After Every Code Change**: After any code modification, run the same checks as GitHub CI:
+   ```bash
+   uv run pytest                                     # all tests must pass
+   uv run mypy src/ --ignore-missing-imports         # no type errors
+   ```
+   Do NOT consider work complete until both commands succeed.
 4. **Simplicity First**: Avoid over-engineering solutions
 5. **Document Changes**: Update relevant documentation
 

src/extractors/filename_extractor.py

@@ -227,10 +227,9 @@ class FilenameExtractor:
         # Check for bare resolution numbers inside brackets (e.g., [720,ukr,eng])
         bare_match = re.search(r'[\[,](\d{3,4})(?=[,\]])', normalized_name, re.IGNORECASE)
         if bare_match:
-            height = int(bare_match.group(1))
+            bare_fc = self._get_frame_class_from_height(int(bare_match.group(1)))
-            frame_class = self._get_frame_class_from_height(height)
+            if bare_fc:
-            if frame_class:
+                return bare_fc
-                return frame_class
         
         # If no specific resolution found, check for non-standard quality indicators
         for indicator in NON_STANDARD_QUALITY_INDICATORS:

src/extractors/mediainfo_extractor.py

@@ -195,7 +195,7 @@ class MediaInfoExtractor:
         resolution = self.extract_resolution()
         if not resolution:
             return None
-        height, width = resolution
+        width, height = resolution
 
         logger.debug(
             f"[{self.file_path.name}] Frame class detection - Resolution: {width}x{height}"
@@ -329,7 +329,10 @@ class MediaInfoExtractor:
             return None
         langs = []
         for a in tracks:
-            lang_code = getattr(a, "language", "und") or "und"
+            lang_code = getattr(a, "language", None)
+            # Skip tracks with no language tag or 'und' (undetermined)
+            if not lang_code or lang_code.lower() in ("und", "undefined"):
+                continue
             try:
                 # Try to get the 3-letter code
                 lang_obj = langcodes.Language.get(lang_code.lower())
@@ -340,6 +343,9 @@ class MediaInfoExtractor:
                 logger.debug(f"Invalid language code '{lang_code}': {e}")
                 langs.append(lang_code.lower()[:3])
 
+        if not langs:
+            return None  # No meaningful language info — let Filename extractor try
+
         lang_counts = Counter(langs)
         audio_langs = [
             f"{count}{lang}" if count > 1 else lang

src/test/test_mediainfo_frame_class.py

@@ -39,7 +39,7 @@ def test_frame_class_detection(test_case):
     extractor.video_tracks = [mock_track]
     extractor._get_tracks.return_value = [mock_track]   # satisfies @requires_tracks_type decorator
     extractor._get_track.return_value = mock_track
-    extractor.extract_resolution.return_value = (height, width)
+    extractor.extract_resolution.return_value = (width, height)
     extractor.extract_interlaced.return_value = interlaced
 
     # Test the method

uv.lock

@@ -208,7 +208,7 @@ wheels = [
 
 [[package]]
 name = "moma"
-version = "0.9.3"
+version = "0.9.4"
 source = { editable = "." }
 dependencies = [
     { name = "langcodes" },