The cut — one real Project, end to end
Every R7 screen marked in or out for the first shippable Studio (6a), and the slice's test stated whole (6b): Moto and one trusted collaborator run the Lightbrush integration end to end — upload, connect, hand off to Claude Code, get work back, record it, and show it in the Field — before anything else ships.
Every screen, marked
The test, run concretely — one page
The run, in order, every step on an in-marked screen: create — Moto says it to Taro inside The Ceremony Machine; the receipt lands; the Project has a rough room in the Field (1a, 1c). upload — Moe drops RenderDeck's API notes and Dolly's tile set into the room; they organize into the graph (5c). connect — Dowbot and Dolly register under the Lightbrush agreement; RenderDeck works unregistered, said plainly (3c). hand off — Elias composes package #7 and sends it to Claude Code on his own machine (4a); the room shows it out, breathing, at the edge (4b). get work back — the return unpacks as draft Records, cited to the package (4c); one retry happens, honestly (4d). record it — Elias presses and holds; the work enters the duna's record vouched for by a person (4e). show it in the Field — the adapter Records stand next to Dolly in the room, and Moe walks over to look (3a).
What the test proves — every load-bearing law under real weight: the command-receipt spine, the Scene-per-Project decision, the server-mediated handoff between two trusted people, the package seam in both its states, provenance surviving from upload to acceptance, and one honest failure. If any in-marked screen isn't exercised by this run, it shouldn't be in; nothing out-marked is needed to finish it.
The R6 cut's test was recursion — the invited can invite. The R7 cut's test is production: the workshop can do a real day's work for a real duna with real tools before it learns any second trick. Studio is what we build everything else with; this slice is the moment it starts being that.