New md_recursive chunked and upserted, need to test

Refactor BlackboxRAG documentation and enhance metadata handling

Add simple baseline chunk/upsert script and fix semantic chunking perf

Add support for loading pre-built chunks from JSON

IMPORTANT: Unzip chunks_md_recursive.zip and then test

feat: enhance markdown migration and embedding processes with entity-aware summaries and provenance context

Clean up: Remove temporary debugging scripts, keep production code and enhancements

Shantu mantu chunking done

my changes

feat: Build 150 document corpus from zenodo GA dataset