Driver.Mqtt.Browser-002/-003/-004/-005.
-002: ObservePlainTopic's pre-pass judged segment LENGTH only, so a plain topic
segment carrying a newline or an ANSI escape became the picker's displayed label —
a rule ObserveSparkplugBirth already applied via IsUsableLabel. The control-character
half is now single-sourced (HasControlCharacter) and the plain marker text converges
with the Sparkplug one. An EMPTY topic level stays accepted on purpose: it is legal
MQTT and its terminal leaf is a real committable address.
-003: GetOrCreate read _nodeCount and incremented it later, so N observers could each
see cap-1 and all insert. The slot is now reserved with one Interlocked.Increment and
given back on both non-consuming paths.
-004: Project ordered a level by Segment alone, but the level is keyed by Path
precisely because two Sparkplug siblings CAN share a Segment — leaving the tie to
ConcurrentDictionary enumeration order, which .NET's randomised string hashing makes
differ per process. .ThenBy(Path) makes the sort total.
-005: no behaviour change — DefaultNodeCap's doc now states the real per-session
ceiling and records that the aggregate across sessions is bounded by the reaper's
idle TTL, not by any session cap.
Joseph Doherty
eddf5f57a5