Read UTF-8 test fixtures with explicit encoding

Path.read_text() without an encoding argument uses the locale
preferred encoding, which on Windows is the ANSI code page (e.g.
GBK on Chinese-locale systems). manifest.toml and the story sources
are UTF-8, so tests/examples failed to collect or run there.

Fixes #3244

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: ShuQingDollarVoyager

tests/examples/conftest.py

@@ -38,7 +38,7 @@
 STORIES_DIR = Path(stories.__file__).parent
 BASE_URL = "http://127.0.0.1:8000"
 
-MANIFEST = tomllib.loads((STORIES_DIR / "manifest.toml").read_text())
+MANIFEST = tomllib.loads((STORIES_DIR / "manifest.toml").read_text(encoding="utf-8"))
 DEFAULTS: dict[str, Any] = MANIFEST["defaults"]
 STORIES: dict[str, dict[str, Any]] = MANIFEST["story"]
 

tests/examples/test_story_shape.py

@@ -27,7 +27,7 @@
 
 def _parse(path: Path) -> ast.Module:
     """Parse ``path`` into an AST module."""
-    return ast.parse(path.read_text(), filename=str(path))
+    return ast.parse(path.read_text(encoding="utf-8"), filename=str(path))
 
 
 def _resolve(node: ast.ImportFrom, package: str) -> str: