Remove superseded configuration loaders and consolidate runtime tests

internal/configuration/load.go

@@ -109,8 +109,7 @@ func Load(main configkit.Input, underlays []configkit.Underlay) (*loaded, error)
 	return load(main, underlays)
 }
 
-// load performs one ConfigKit lifecycle over the selected source tiers. Engine
-// assembly is intentionally not connected to this adapter yet.
+// load performs one ConfigKit lifecycle over the selected source tiers.
 func load(main configkit.Input, underlays []configkit.Underlay) (*loaded, error) {
 	state := &loaded{
 		backends: make(map[string]map[string]fieldState),

internal/configuration/targets.go

@@ -103,7 +103,7 @@ func (state *loaded) buildExecutionProfiles() error {
 			}
 			target.ExtraParams = merged
 		}
-		profile := domain.ExecutionProfile{ID: id, BackendID: target.BackendID, ResolvedTarget: &target, TargetPresence: presence}
+		profile := domain.ExecutionProfile{ID: id, ResolvedTarget: &target, TargetPresence: presence}
 		state.indexedProfiles[id] = profile
 	}
 	return nil