fix: resolve CI mypy type checking issues

src/patternforge/analyzer.py

@@ -49,13 +49,15 @@ class CodeAnalyzer:
     def __init__(self, language: str, config: Config) -> None:
         self.language = self.LANGUAGE_MAP.get(language, language)
         self.config = config
+        self._parser: tree_sitter.Parser | None = None
+        self._language: Any = None
         self._try_init_language()
 
     def _try_init_language(self) -> None:
         try:
             self._parser = tree_sitter.Parser()
             self._language = get_language(self.language)
-            self._parser.set_language(self._language)
+            self._parser.language = self._language
         except Exception:
             self._parser = None
             self._language = None
@@ -72,7 +74,7 @@ class CodeAnalyzer:
             "go": [".go"],
             "ruby": [".rb"],
         }
-        return extensions.get(self.language, [f".{self.language}"])
+        return set(extensions.get(self.language, [f".{self.language}"]))
 
     def _is_code_file(self, path: Path) -> bool:
         return path.suffix in self._file_extensions()
@@ -202,7 +204,7 @@ class CodeAnalyzer:
                 indent_sizes[indent] = indent_sizes.get(indent, 0) + 1
 
         dominant_style = "space" if style_votes["space"] >= style_votes["tab"] else "tab"
-        dominant_indent = max(indent_sizes, key=indent_sizes.get, default=4)
+        dominant_indent = max(indent_sizes.items(), key=lambda x: x[1], default=(4, 0))[0]
 
         return {
             "language": self.language,