I've been researching entity-level diffing as an alternative to line-level diffs. The idea: use tree-sitter grammars to extract structural entities (functions, classes, methods) from source code, then build a cross-file dependency graph by resolving references between them.

traditional diff tools compare lines, but the meaningful unit of change in code is an entity. When you rename a function, move a method, or reformat a file, line-level diff produces noise. Entity-level diff tells you "this function was modified, this one was added, this one moved."

The interesting technical bits:

- Each language gets a config that maps AST node types to entity types (e.g. function_definition in Python, function_item in Rust, method_declaration in Java).…