Clarifies the open fork from §4/§9: Development A (sandbox launcher) and CB-308
(per-host federation) COMPOSE — each host runs a bridged gateway whose launcher
spawns agents into that host's LOCAL sandboxes; the broker moves messages +
presence, never keystrokes.
The forcing fact: delivery is herdr keystroke-injection into a locally-owned PTY,
so "a sandboxed agent on another host" ≡ "a sandbox spawned by that host's
gateway" (a remote container with no local herdr can't be injected into). Rules
out a central daemon reaching remote PTYs.
Adds Figure 11 (composed topology) + Figure 12 (remote-delegation sequence: the
local?inject:publish fork with a sandboxed far side — both injection points stay
local, only the middle hop crosses the broker), the two forced reachability
changes (host-routable mcpUrl; PTY in the local gateway's herdr), and a
maps-to-existing-seams table (CB-308 gateway × Dev-A launcher, CB-117 reap,
CB-303 container lifecycle, CB-308 #5 trust). No new pillars. Both diagrams
mmdc-validated; §4/§9 updated to point at §11.
Scopes the lead's next direction on top of the peer-launcher arc, as a
proposal (ticket split deferred):
- A · sandboxed, role-specific workers — a sandbox is a *placement*, so it
slots into the CB-401 SPI as a new kind: sandbox adapter exactly the way
CB-402's opencode slotted in as a new provider (SPI proven placement-neutral,
not just provider-neutral). Ownership line held: bridge launches INTO a
peer-owned image, never provisions the IDE/dev-tools inside it.
- B · main-agent pairs (Opus + cloud) — both mains are MCP clients so neither
can be called into; each needs a pull inbox → depends on CB-308's per-agent
channels. PrimaryRegistry single-slot → multi-slot.
- C · orchestrator tier — SessionManager recursed one tier up
(orchestrator:mains :: main:workers) + context scoping; re-roots the human
from a live primary to the orchestrator.
10 mermaid diagrams (component + sequence per development, ownership guardrail,
staging graph), all mmdc-validated and theme-safe. §7 pins the bus-vs-env-manager
boundary as an acceptance criterion on A; §8 stages A → CB-308 substrate → B → C.
Dai Ha