🔧 Fix HuggingFace YAML metadata in repo card

Added comprehensive YAML frontmatter to resolve HuggingFace Hub warning:

✅ METADATA ADDED:
- License: AGPL-3.0 (open source research)
- Task categories: text-classification, feature-extraction, text-retrieval, text-generation
- Language: English (code comments and documentation)
- Size category: 1M-10M records (1.4+ million total)

🏷️ COMPREHENSIVE TAGS:
- rust, compiler, llvm, semantic-analysis, code-understanding
- programming-languages, compilation, optimization, performance
- machine-learning, dataset, parquet

📊 DATA CONFIGS:
- semantic: parsing, name_resolution, type_inference splits
- cargo: project_metadata split
- llvm_ir: ir_generation split across optimization levels
- compiler: compiler analysis splits (parsing, name_resolution, type_inference)

🎯 HUB OPTIMIZATION:
- Pretty name for better discoverability
- Proper file path configurations for data loading
- Viewer disabled (large dataset, use programmatic access)
- Complete metadata for ML researchers and tool developers

This resolves the 'empty or missing yaml metadata' warning and makes
the dataset properly discoverable and usable on HuggingFace Hub!

README.md

@@ -1,4 +1,57 @@
-# Complete Rust Compilation Pipeline Dataset: llvm-sys.rs
+---
+license: agpl-3.0
+task_categories:
+- text-classification
+- feature-extraction
+- text-retrieval
+- text-generation
+language:
+- en
+tags:
+- rust
+- compiler
+- llvm
+- semantic-analysis
+- code-understanding
+- programming-languages
+- compilation
+- optimization
+- performance
+- machine-learning
+- dataset
+- parquet
+size_categories:
+- 1M<n<10M
+configs:
+- config_name: semantic
+  data_files:
+  - path: "semantic/parsing-phase/*.parquet"
+    split: parsing
+  - path: "semantic/name_resolution-phase/*.parquet"
+    split: name_resolution
+  - path: "semantic/type_inference-phase/*.parquet"
+    split: type_inference
+- config_name: cargo
+  data_files:
+  - path: "cargo/project_metadata-phase/*.parquet"
+    split: project_metadata
+- config_name: llvm_ir
+  data_files:
+  - path: "llvm-ir/ir_generation-*-phase/*.parquet"
+    split: ir_generation
+- config_name: compiler
+  data_files:
+  - path: "compiler/parsing-phase/*.parquet"
+    split: compiler_parsing
+  - path: "compiler/name_resolution-phase/*.parquet"
+    split: compiler_name_resolution
+  - path: "compiler/type_inference-phase/*.parquet"
+    split: compiler_type_inference
+pretty_name: "Complete Rust Compilation Pipeline Dataset"
+viewer: false
+---
+
+# Complete Rust Compilation Pipeline Dataset
 
 This dataset contains the most comprehensive analysis of Rust compilation ever created, covering the complete pipeline from source code to LLVM IR generation.