Recorder mock — M0.21

The M0.21 proof point: the full layered scene tree from recorder-features-and-render-api.md §4, rendered headless.

The compositor stack, back-to-front:

1. Gradient background panel — a Graphics linear gradient covering NDC.
2. Recording quad — placeholder for the screen capture, drawn as a rounded Graphics with stroke (the real M2 path swaps in a Sprite wrapping a VideoTexture fed by ScreenCaptureKit).
3. Camera bubble — rounded Sprite in a corner.
4. Cursor sprite + click ripple — a small textured Sprite plus a Graphics ellipse scaled-up beneath it.
5. Keyboard chip — rounded Graphics with a Text label inside.
6. Caption text — Text under the recording quad.

Render output: target/recorder_mock.png. Stats reported on stdout: draw_calls=5, sprites=3, graphics=4, glyphs=43, meshes=0. Every primitive type wisp ships is exercised in one frame — if recorder_mock runs cleanly, the public API surface is sufficient for the recorder's editor preview.

cargo run -p wisp --example recorder_mock

The mock uses synthetic textures (a checker pattern for the recording quad's stand-in, a simple sprite for the cursor). M2+ replaces these with real capture frames; the scene-graph shape stays the same.

Stage · Sprite · Graphics · Text · Recorder feature inventory (offsite — workspace docs)