Replication Package: Structure-Aware Semantic Chunking with Title-Chain Prefixes

Replication package for the paper 'Structure-Aware Semantic Chunking with Title-Chain Prefixes: A 1600-Query Evaluation and the Measurement Trap in Text-Transform Ablations'. Contains semantic_chunking.py (three-stage pipeline: header-split, semantic merge, title-chain prefix), eval_runner.py (MRR@5 evaluation harness with dual annotation and Cohen's kappa), and the independent recomputation report of all main-result numbers (MRR@5 0.374->0.463 full-set, 0.828->0.925 answerable-subset n=563, kappa 0.45 unweighted). Query set and annotation data are from a private knowledge base and not included. Paper: arXiv preprint (2026). Related: GitHub issue NousResearch/hermes-agent#76320.