CompilingThings Compile Benchmark for MQL5 - v1.1.0

Dataset card: enable Viewer for the two public benchmark files (prompts, per_item_results); add size_categories n<1K; body unchanged

Dataset card tags: keep mql5, drop metatrader-5 and code (trademark-conservative); body unchanged

Add dataset-card discovery metadata (pretty_name, language, task_categories, tags); body unchanged

CompilingThings Compile Benchmark for MQL5 - v1.0.0