Add error handling for invalid or missing YAML config#11
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- Introduce ConfigError for all config-related failures - Config.load now rescues Errno::ENOENT (missing file) and Psych::SyntaxError (malformed YAML) with friendly messages - Config.new validates: root must be a Hash, no unsupported top-level keys, required keys present, correct types for library and devices - Each device entry is validated for unsupported keys, required fields, and string types - CLI wraps Config.load in a helper that rescues ConfigError and exits with a clear message - Add 22 tests covering all error paths and valid config loading https://claude.ai/code/session_01E5tVtnZjoqJkERUVTVKaTf
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