[rs545837]

usually the whole discussion has been around line-level vs commit-level history, but there's a layer nobody's talking about, and I have been exploring it here these days with https://github.com/Ataraxy-Labs/sem. It gives you entity-level version control. It parses your code into functions, classes, methods using tree-sitter (12 languages so far), computes a structural hash for each entity, and builds a cross-file dependency graph. So sem diff HEAD~1 doesn't give you "+3 -2 in tax.py", it gives you "calculate_tax signature changed, 47 dependents, 3 callers will break". The key insight is distinguishing signature changes from body changes.