Split HTTP verification reads into Assert in C# API and integration tests.
Add # Arrange/# Act/# Assert to GdUnit suites and keep Act free of assertions
where casts and busy guards are under test.
Add selection_event signal when lockedTargetId changes; attribute tab, clear,
and server_correction from POST/GET paths. Optional log_selection_events print.
GdUnit coverage; README, E1.M3 snapshot, manual QA, and plan checklist updated.