How chunkless RAG works

Chunkless retrieval is a four-step loop:

Document outline (per-section summaries)

1. SELECT -- LLM picks the most relevant unvisited section by reading the outline + query.

2. FETCH -- Pull the *full text of that section's subtree from the DoclingDocument.

3. ATTEMPT -- LLM tries to answer from the section text. Returns {can_answer: bool, response: str}.