feat(analyser): expose destination topic to Analyser via Message.destinationName

[krital]

Summary

• Adds a transient destinationName field to Message, set by the engine in Protocol.processMessageAnalyser() immediately before calling analyser.ingest()
• Gives Analyser implementations access to the MAPS topic a message arrived on, with no impact on serialisation, persistence, or existing analysers

Motivation

Currently Analyser.ingest(Message) has no way to know which topic the message came from. The engine caches one Analyser instance per topic (topicNameAnalyserMap), but a router-style analyser that manages multiple per-topic models internally needs the destination at ingest time.

This is needed to support MicroGptRouterAnalyser in the upcoming maps-microgpt-mavlink-demo: a single Analyser plugin that maintains one micro-GPT model per subscribed topic, routing by msg.getDestinationName().

Changes

Two files, five lines added:

• Message.java — new @Getter @Setter private transient String destinationName in the existing transient-data fold (same pattern as lastMessage and bound)
• Protocol.java — one line: msg.setDestinationName(parsedMessage.getDestinationName()) before analyser.ingest(msg)

Test Plan

• Existing tests pass (no behavioural change for analysers that ignore destinationName)
• Confirm field is not included in Message.pack() / serialisation (it is transient)
• Verify a custom Analyser can read msg.getDestinationName() and get the correct MAPS topic

🤖 Generated with Claude Code

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• Commit unit tests in branch feat/analyser-destination-context

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