Cuts explanation that restated the code or repeated itself, and keeps the parts
a future change would otherwise undo.
The same fact was asserted in three places: BanChannel.IsExempt, BanExemptions
and LoginAllowlist each explained that an exemption withholds escalation only.
It now lives on the seam that defines it, and the other two point at it.
The seed short-read comment was eight lines arguing a decision; the load-bearing
part is that waiting costs a connection slot per one- or two-byte client, so
that is what it says now. The new test-collection markers are one line each
rather than a summary of how STArrayPool works internally.
Also drops a fully-qualified System.Func in BanExemptions in favour of a using.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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