apps/shared/src/gateway-events.ts is now a thin layer over
gateway-contract.generated.ts (client-local synthetic events + the
GatewayEvent envelope); gateway-events.json, its two rendezvous tests and
the duplicated BillingBlock / SessionInfo / ProjectInfo hand copies are
gone. Desktop, TUI, web and shared typecheck against the generated
RpcMethods / ServerRequestMap / BackendGatewayEventMap.
What tsc found once the types were honest: three phantom fields the
backend never sent (tool.start.todos, error.reason,
voice.transcript.voice_stopped) - the TUI todo tests were driving the
list through the phantom and are retargeted to tool.complete, where the
wire actually carries it; nullable fields (`None` on the wire) were typed
as plain optionals in eight places and now coerce at the boundary;
SessionResumeResult had a stale generic.
Contract fixes from the consumer pass: TranscriptMessage is the gateway
projection (text/row_id/context/args), not the stored row; SkinPayload
matches HermesSkin (empty-string defaults, never null); SessionLiveInfo
model/tools/skills are required (always emitted); BillingBlock.billing_url
is required-nullable (dataclass asdict).
tui_gateway/AGENTS.md documents the declare -> regenerate -> tsc loop.
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