/understand-diff Analyze the current code changes against the knowledge graph in the project's data directory ( , or the legacy when that directory is present). Graph Structure Reference The knowledge graph JSON has this structure: - — {name, description, languages, frameworks, analyzedAt, gitCommitHash} - — each has {id, type, name, filePath?, summary, tags[], complexity, languageNotes?} - Code node types: file, function, class, module, concept - Non-code node types: config, document, service, table, endpoint, pipeline, schema, resource - Domain/knowledge node types: domain, flow, step, arti…