Replace trait constants and array_is_list usage with equivalent PHP 8.0 constructs. Add strict list/expiry regressions and make isolated reflection tests PHP 8.0 compatible. No control activation, threshold or configuration change.
Add opt-in SDL measurement sources and independent visualization toggles. Exclude balancing power from household telemetry and new household energy. Preserve custom views and cover measurement, migration and Symcon 8.0 behavior.
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