Helix Fleet

Mission control. Fleet is a global singleton (port 4890). Every session up (spark, canvas, loop, arena, swarm, stream, archive) starts it when it is down and returns fleet: {url, started}, so the board is there whenever a session is; servers register with it on start, push their needs-you items on change, and Fleet health-pings them for liveness. Agents never push to Fleet — the only agent verbs are up and status.

CLI

# start/reuse THE fleet server (port 4890), open the board
${CLAUDE_PLUGIN_ROOT}/bin/helix fleet up [--no-open]

# registry as JSON: {sessions:[...], attentionTotal}
${CLAUDE_PLUGIN_ROOT}/bin/helix fleet status