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GET /api/v1/wait long-poll: the box holds an authed hanging GET; the hub completes it the instant any operator intent bumps that customer's in-memory generation, then the box fires its ordinary report and the ACK delivers everything through the unchanged machinery. 240s hold with a 25s heartbeat newline defeats the nginx 60s proxy_read_timeout with no ingress annotation; WriteTimeout lifted per-connection via ResponseController. - internal/intent: per-customer generation counter + waiter registry (Bump/Wait/Close), coalescing to latest, race-closer, in-memory by design. Red-proofs: counter-vs-queue + race-closer (run-fail-reverted). - api/wait.go: the endpoint (per-customer only; global key 400; A cannot see B). - web bumps after every intent write (fire-after-commit): config CRUD, claim resend, offsite re-issue/freeze, password regen, block/unblock, floors (global bumps all config-managed), controller log-tail + log-bundle. - main.go: one intent hub shared by web+api; Close() before server.Shutdown. Pairs with controller v0.140.0 (the long-poll client). Grounding: documentation/audits/SPIKE-immediate-sync-transport-2026-07-16.md.