- index.html: role=region on phase-bar, strategy-panel; role=dialog+aria-modal on help overlay, offline popup, drift ending; aria-label on help button, close button, continue button, start over button; aria-live on progress label
- render.js: aria-label on alignment event buttons; fix exportSave() URL revoke race with setTimeout delay
- engine.js: aria-label+aria-pressed on buy amount buttons; role=button+tabindex+aria-expanded+aria-controls on completed projects header
