https://gitlab.synchro.net/main/sbbs/-/commit/35fa5b0d4150078a76e4ab7d
Modified Files:
src/sbbs3/mqtt_broker.cpp mqtt_topic.cpp mqtt_topic.h
Log Message:
mqtt_broker: periodic cleanup of expired retained messages

Walk the topic tree once per minute and remove retained messages whose MESSAGE_EXPIRY property has elapsed. Previously, expired retained
messages were only skipped on delivery to new subscribers but never
actually removed from the tree.

Nothing currently sets MESSAGE_EXPIRY, but this prevents unbounded
accumulation if/when publishers start using it.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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