New md_recursive chunked and upserted, need to test

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

IMPORTANT: Unzip chunks_md_recursive.zip and then test

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

Merge branch 'main' of https://github.com/Abdullah-Khan-Sherwani/BlackboxRAG

feat: implement parent chunking, diversity tuning, and network resilience

my changes

feat: Added chunking generator for 3 basic types