96db73d1c650e3d531c8f4e472aa9a3813f3d0c0
Add DeliverRetainedOnSubscribe to MqttRetainedStore, which iterates GetMatchingRetained and fires a callback with (topic, payload, qos, retain=true) for each match. Add 11 unit tests covering exact-match, '+' single-level, '#' multi-level, no-match, cross-level rejection, callback arguments, return count, and empty-store behaviour.
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