Module limits 

Contractual bounds (docs/ARCHITECTURE.md). These are protocol facts both sides must agree on, not tunables.

Constants

EVENT_QUEUE_CAP

Per-subscriber bounded event queue; overflow drops the oldest event (counted + warned — a slow reader never blocks volume threads).

MAX_PAYLOAD_LEN

Hard cap on a single pipe frame’s payload; announcing more is a protocol violation (connection dropped).

MAX_RESULTS_PER_CONN

Per-connection result-handle registry cap; beyond it the least recently used handle is evicted (its pages answer STALE with an “evicted” detail).

PAGE_ROWS

The client’s page-fetch granularity (rows per ResultPage request and the UI virtualization page size). The wire itself accepts any count.