Node.js Realtime Backpressure Contracts for Shared Kanban Board Tests

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Short answer: keep the board's event log authoritative, apply backpressure at the connection boundary, and test state convergence instead of hoping wall-clock sleeps line up. For a healthtech chat room or shared kanban board, presence accuracy is the decision axis: a delayed cursor is annoying, but a stale "online" clinician can misroute work. The useful contract is small. Every mutation gets an ordered sequence, every reconnect asks for a cursor, and presence is explicitly soft state with a lease. A test should control delivery and acknowledgements with a virtual clock.

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