chore: normalize line endings to LF, add .gitattributes

- Add .gitattributes with text=auto eol=lf for all text files
- Renormalize all files in index to LF line endings
- Fixes massive whitespace-only diffs between main and feature branch

tests/plugins/missing_model_requirements/__init__.py

@@ -1,28 +1,28 @@
-"""Invalid plugin: missing MODEL_REQUIREMENTS."""
-
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-from abogen.tts_plugin.manifest import PluginManifest
-from abogen.tts_plugin.types import EngineConfig
-
-PLUGIN_MANIFEST = PluginManifest(
-    id="missing_model_requirements",
-    name="Missing Model Requirements Plugin",
-    version="1.0.0",
-    api_version="1.0",
-    description="Plugin missing MODEL_REQUIREMENTS",
-    author="Test Author",
-)
-
-# This plugin intentionally does NOT export MODEL_REQUIREMENTS
-
-
-def create_engine(
-    context: Any,
-    model_path: Path | None,
-    config: EngineConfig,
-) -> Any:
-    raise NotImplementedError("This plugin is invalid")
+"""Invalid plugin: missing MODEL_REQUIREMENTS."""
+
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any
+
+from abogen.tts_plugin.manifest import PluginManifest
+from abogen.tts_plugin.types import EngineConfig
+
+PLUGIN_MANIFEST = PluginManifest(
+    id="missing_model_requirements",
+    name="Missing Model Requirements Plugin",
+    version="1.0.0",
+    api_version="1.0",
+    description="Plugin missing MODEL_REQUIREMENTS",
+    author="Test Author",
+)
+
+# This plugin intentionally does NOT export MODEL_REQUIREMENTS
+
+
+def create_engine(
+    context: Any,
+    model_path: Path | None,
+    config: EngineConfig,
+) -> Any:
+    raise NotImplementedError("This plugin is invalid")