mex-relay

# MEX Relay Prepare durable team handoffs that another engineer can continue from. Never represent a Relay as a sent message or notification. ## Prepare a Relay draft 1. Infer the useful session state: a concise summary, current position, completed work, in-progress work, blockers, unresolved questions, next actions, and relevant decisions, files, code, commits, or external links. 2. For “whoever picks this up,” choose open-to-team. It includes future active project Members; no Member lookup is needed to save this local draft. If the user names people, retain named-recipient intent and resolve exact IDs only when needed. An unresolved named draft may stay recipient-free locally; do not silently publish it to everyone. 3. Default to a standalone Relay. Use the local-save shortcut for a new draft; keep the structured preview/apply path for exact updates and canonical actions. 4. Include an existing relevant Workstream only as typed evidence. Never invent one or turn saving a handoff into Workstream creation. 5. Add optional typed context references only when the referenced IDs, paths, commits, or URLs are known. Never invent provenance. 6. Resolve the action-scoped runtime contract. For a new draft, `mex relay draft save --from <draft.json> --json` performs the exact local preview/apply internally. For an update, build and preview the structured request. 7. An explicit create/save/draft request authorizes that local write without another confirmation. Publication remains sep...