- Add ExecutionOverlay React component with header, node badges, data popup, timeline scrubber
- Add ExecutionNodeBadge: status badge positioned in canvas-space at each node
- Add ExecutionDataPopup: floating popup showing input/output/error data for selected node
- Add ExecutionTimeline: fixed scrubber bar with Prev/Next, range input, step dots
- Add #execution-overlay-layer DOM layer to nodegrapheditor.html
- Wire renderExecutionOverlay/updateExecutionOverlay into nodegrapheditor.ts
- Wire ExecutionHistoryPanel pin button via EventDispatcher execution:pinToCanvas event
- Add 20 unit tests for overlay utility functions
- Update PROGRESS-dishant.md: CF11-006 and CF11-007 both complete