dsh-model-parameters: Auto-Complete Model Metadata

`dsh-model-parameters` is a DeepSeek Harness plugin designed to address the lack of key metadata in the provider list. By reading the local `models.dev` directory, it automatically fills in the model name, context window, maximum output token, reasoning level, and input modality. It features a smart trigger mechanism, reconciling only when settings change or the cache expires, and uses a fill-only update strategy that does not overwrite existing values. The plugin provides a visual configuration interface and supports manual refresh of the directory cache; its deterministic matching logic ensures data accuracy, effectively lowering the configuration barrier for agent development.