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agessaman
1bfbbf4bd8
The preset table is fleet state, not a build detail. A slot's preset is stored in /mqtt.json by name, and firmware that does not know a name does not merely ignore it: MQTTPrefsSerializer repairs it to "none" and CommonCLI writes the repaired file back to flash. A node that rolls back to a channel missing a preset therefore loses that slot permanently, and re-upgrading does not bring it back. The parity gate compared preset names only, deliberately allowing URL, CA and credential drift. It now requires src/helpers/MQTTPresets.h to be byte-identical between the channels, which also catches that drift — the two channels are meant to dial the same brokers. That is only workable if the file holds no channel-specific code, so mqttPresetEnforcesTokenExp() moves to the new MQTTPresetPolicy.h. It was the sole difference between the two channels' copies, and with it moved they match exactly today. Policy keyed off the table belongs there from now on; the table itself stays pure data. The older name-only comparison stays available without --exact for ad-hoc use, and the checker's self-test now covers both modes, including that --exact rejects a config-only change the name check waves through.