Synthesis: place three positions, compare every four-bar they admit, insert one

e2e/README.md

@@ -33,6 +33,7 @@ their source. Everything browser-driven lives here.
 - `template-thumbnails.mjs` — regenerates the library cards' images in `src/assets/gifs/` by opening each generated template payload and clipping the canvas. Not a check: it writes assets, so run it after `npm run template-payloads` changes a payload
 - `playback-timing.mjs` — real-time playback: a revolution takes 60/RPM wall-clock seconds, the reported cycle period scales with input speed, and simulation time is held (not the sample index) across a speed change
 - `input-settings-and-playback.mjs` — the input joint's Input Settings section (direction, unit-free speed field, RPM / deg/s / rad/s picker), its removal from global Settings, the time field's width, and that playback interpolates between samples at a slow input speed
+- `synthesis-redesign.mjs` — Synthesis end to end: the chooser, arming and dropping the three positions (wheel turns the one about to land, and does not zoom), dragging one without panning the canvas, Generate, the candidate gallery and its hover comparison, the six-bar driver, the preview transport, Insert and its Undo, and the design surviving undo and redo
 
 ## Running