A connector conversation now names its source (slack, discord or linear), and a posted reply reports a neutral messageId. Each machine's hello lists the sources it accepts, and the cloud only routes a Slack conversation to machines that list Slack. Machine events from other sources are filtered out where they arrive, and a reply for a non-Slack conversation is refused, so a Discord or Linear conversation can never post into a Slack thread with the same id. The unused turn-bound cancel fields are removed (they return with Stop). Inert: no shipped desktop uses the contract, and Slack is off unless configured.
The connector cloud now assigns each machine connection's revision instead of trusting the desktop's saved number. Acks, events and polls from an older connection get 409 hello_required, and the desktop announces itself again. Also records the cloud's request size limit in the shared contract and adds the current turn to the machine snapshot so a stale turn end cannot clear a newer prompt. Connector service only; not deployed to production.
Adds cloud/packages/connector-contract: the shapes the desktop and the cloud connector service exchange (hello, held poll, received/done acks, events with per-hello seq, replies), limits, error codes and the contract version. Nothing calls it yet.
Jinwoo Hong