docs: High-throughput, channel handling and Mosquitto UNSUBACK notes - #119
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Adds three documents describing the message-processing model used by the UI: - docs/high-throughput-guide.md - why dispatcher pressure appears above a few thousand messages/second and how channel ingestion plus Rx buffering solves it. - docs/channel-handling.md - channel full modes, packet inspection constraints, counters and pipeline lifecycle. - docs/mosquitto-unsuback-dropped-issue.md - broker-side bug where UNSUBACK packets are dropped when the outgoing queue is full. Documentation only, no code changes.
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Split out of #118, per @chkr1011's request for smaller per-topic PRs.
Documentation only — no code changes, nothing to build.
docs/high-throughput-guide.md— why dispatcher pressure shows up above a few thousand messages/second, and the channel + Rx buffering model used to fix it.docs/channel-handling.md— channel full modes, packet inspection constraints, counters and pipeline lifecycle.docs/mosquitto-unsuback-dropped-issue.md— broker-side bug where UNSUBACK packets are dropped when the outgoing queue is full.These describe the design implemented in #118. Merging this first keeps that PR to code only.