Implement RAG summarization and context pipeline

- Add ContextPipeline for async RAG lookups
- Implement RAG result summarization via LLMProcessor
- Add CLI flag for PDF ingestion
- Strip markdown code blocks from LLM responses
- Update TUI context display to use ListItems

main.py

@@ -1,4 +1,24 @@
+import argparse
+
+from src.rag.manager import RAGManager
+
+
 def main():
+    parser = argparse.ArgumentParser(description="D&D Helpers CLI")
+    parser.add_argument(
+        "--ingest-pdf",
+        type=str,
+        help="Path to a PDF file to ingest into the RAG system",
+    )
+
+    args = parser.parse_args()
+
+    if args.ingest_pdf:
+        print(f"Ingesting PDF: {args.ingest_pdf}...")
+        rag_manager = RAGManager()
+        rag_manager.ingest_pdf(args.ingest_pdf)
+        print("PDF ingestion complete.")
+
     print("Hello from dnd-helpers!")