Technical spike / Checkpoint 4C
Can the signature dither feel alive without becoming the page?
This isolated feasibility test uses a small, dependency-free canvas layer for slow internal movement and subtle pointer response. The approved static swoop remains the complete fallback.
Feasibility boundary
The field is decorative and independent of the reading layer. It does not alter scrolling, navigation, page structure, or the production homepage.
Production curve geometry, cross-page continuity, parallax, pinning, and final integration remain decisions for later checkpoints.