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PresetRegistry._load() catches json.JSONDecodeError and FileNotFoundError to start fresh on a corrupted or missing registry, but a registry file with invalid UTF-8 bytes raised UnicodeDecodeError before JSON parsing began, crashing every preset command. Catch UnicodeDecodeError in the same clause: undecodable bytes are the same corruption class as unparseable JSON. OSError stays uncaught on purpose — the data may be intact on disk, and starting fresh would let a later _save() wipe it (same fail-closed reasoning as the workflow catalog cache loader). Assisted-by: GitHub Copilot (model: claude-fable-5, autonomous) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>