P8: on the native transport the bounded-parallel read window is also the cap
on services per Multiple Service Packet (the device's shared scheduler packs
whatever is queued, within the connection's request/reply byte budget), so the
default 8 cost a 1000-tag controller ~125 round trips per poll instead of ~10.
The effective window (AbCipDriver.ReadWindow) is now max(64, option) when the
native tag factory serves reads; libplctag and injected factories keep the
option exactly. Option doc + AdminUI help text updated (Razor: Wave 4 live
check).
P7 addendum: a work item now takes its window slot only after its runtime
exists. A cold create queues on its device's single-flight connect gate, and
holding a slot there let one dead device's backoff-expiry attempt occupy the
whole window for a full Timeout, stalling every other device's reads.
Refs #737
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
Joseph Doherty
4e9bd9d966