Two trusted members in one Project: Elias and Moe in the Lightbrush integration. Presence and handoffs (3a), files, sync, and working on each other's machines — all mediated by the server, everything traced (3b) — the trust boundary rendered honestly as the four-quadrant matrix (3c), and one moment of the Sentinel's effect (3d).
In the Field, a collaborator's presence is where they are and what they're near — never a green dot with a timer. A handoff is spoken, carried by the server, and lands as an ACTION at the other end.
No presence meters: no "active 2h", no typing indicators across members. You see where someone is and what they said. Their ally answers "is Moe around?" honestly, in a sentence, within what Moe shares.
What a trusted relationship unlocks: Elias can run the adapter's builds on Moe's render machine — because Moe granted exactly that, the server carries every command, and both sides watch the same trace. Untrusted relationships cannot do this at all; there is no "request access" flow to escalate one — trust is established between people, in conversation, then stated to allies.
What trusted unlocks (and untrusted doesn't): sending files that sync · state that syncs both ways · running granted commands on each other's machines · allies speaking to each other with standing context. Untrusted relationships still converse and still exchange — but nothing lands on a machine, nothing syncs, and every artifact stays server-held at arm's length.
The member's machine stays theirs: the ally coordinates, it doesn't colonize (Integrations §1). The grant names commands, not disk access; there is no remote desktop, no file browser into someone's life.
Relationships are trusted or untrusted; resources are registered or unregistered. Four combinations, all legal, all workable — the matrix describes standing, never safety. Inside the shared Project, each quadrant is one sentence about what the thing can do.
The two axes never blur (law): trusted/untrusted belongs to relationships between parties; registered/unregistered belongs to resources. A registered resource is never called "trusted," and registration alone never earns closeness.
Movement between quadrants is conversational: "register RenderDeck" is a command with a receipt; trusting a relationship is the two people saying so, each to their own ally.
Hour five of a hot working session: Elias and Moe have been trading builds fast, and the last three exchanges got shorter and sharper. The Sentinel acts through the allies — pacing, not correction. Nothing renders as an instrument; each member hears one plain sentence, from their own ally, in their own register.
The design rule: the Sentinel is visible only as effects and plain sentences. In Studio that means pacing lives inside the ally's ordinary helpfulness — a well-timed suggestion with a true reason — and is indistinguishable from good manners, because that's what it is.