Motion storyboard: system presentations (C1c)

Each strip samples one interaction at the G-MOTION filmstrip points f = 0, .15, .35, .5, .75, 1 (PLAN §2.3, D2 §11.9) over its longest channel: closed-form springs (k = (2π/d)², ζ = 1 − b), D2 §11.2 tokens only. Glass leads on entry and content on exit; text never scales. Reduce Motion: a 150–200 ms cross-fade to the end state. Tiles are crops at 0.24–0.27 scale.