Studio is the first surface where the Field and Chat live together on a big screen. The layout grammar (2a), what the flexible HUD holds on desktop and what it refuses (2b), and the same Project — the Lightbrush integration — at all three Scene production grades so the fidelity ladder is legible (2c). Moving between postures is chrome, never a door (2d).
All four are legal (canon). Each has a job; none is a mode you configure — the surface takes the posture the work asks for, and you can always insist with the two standing words.
The same Scene — the Lightbrush integration workroom — at the three production grades. Same objects, same HUD, same grants; only the rendering climbs. Grade never gates capability: everything you can do in the crafted room you can do in the words-and-pixels one.
The ladder is climbed in place: the room upgrades around the work without moving anything. Provenance chips are the constant — every grade states what drew it.
Keyboard: the spacebar-hold peek (hold to glance at the other rendering, release to return) is proposed in MOTION-ADDENDUM-R7 and flagged in OQ-3 — it's the one Studio-only gesture this round adds.