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* fix(extensions): use explicit UTF-8 encoding when reading manifest YAML On Windows, Python's open() defaults to the system locale encoding (e.g., GBK on Chinese Windows), which causes UnicodeDecodeError when extension.yml or preset.yml contains non-ASCII content such as Chinese characters in description fields. Add encoding='utf-8' to ExtensionManifest._load_yaml and PresetManifest._load_yaml so manifests are read consistently across platforms. Fixes #2325 * test(extensions,presets): add UTF-8 manifest regression tests for #2325 Positive: extension.yml/preset.yml with non-ASCII (Chinese + emoji) descriptions load correctly when written as UTF-8 bytes — fails on Windows without explicit encoding='utf-8'. Negative: files containing invalid UTF-8 bytes raise a clean error (ValidationError or UnicodeDecodeError), not a silent crash. * fix(extensions,presets): wrap I/O and decode errors as ValidationError Address remaining Copilot concerns on #2370: - Catch UnicodeDecodeError and OSError in both manifest loaders and re-raise as ValidationError / PresetValidationError so callers see a consistent error type, not a bare decode/IO traceback. - Validate that PresetManifest YAML root is a mapping (extensions.py already had this; presets.py was missing it). Treat None as {} for empty-file compatibility. - Tighten the negative regression tests to assert the specific message, and add a non-mapping-root test for PresetManifest matching the existing one for ExtensionManifest.