- Introduce VignetteHub/VignetteWindow/VignetteModel to play quest-gated
dialogue scenes over location clips on the surface (bar/shop)
- Ship first scene: Special Delivery step 1 (Trestle + Carol at the bar),
replacing the old capitalLanded check with a vignettePlayed witness
- Add q3 speech clips for Carol and Trestle; remove retired q2 Carol clips
- Wire save/restore of the played ledger, deck lock while a scene holds,
per-sound music ducking under voices, and window sizing to each line
- Add dev flow test (dev/vignette-flow.html/mjs) and model unit tests
- Point landing.json ice-land-01 entry at the new arid-* video assets
