EditorSections.tsx (524 LOC) split into EditorSections.tsx (267 LOC) and EditorSectionsB.tsx (279 LOC). DeletionLogicSection and StorageSection moved to B; SetFn type canonical in B. EditorSections re-exports both so all existing imports from EditorTab.tsx remain valid unchanged. SDKPipelineSidebar (193), SourcesTab (311), ScopeDecisionTab (127), ComplianceAdvisorWidget (265) were already under the 500-LOC hard cap. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>