Follow-up from PR #548. The StudioMember async binding flow is functional and now completes through the binding-run actor continuation, but the legacy ScopeBindingCommandApplicationService still waits for service catalog and serving-set readmodels after issuing service lifecycle commands, using bounded polling before returning from UpsertAsync. That makes bind ACK semantics imply "readmodel observed / immediate invoke is safe", while coupling the command path to readmodel freshness and keeping Task.Delay polling in application logic.\n\nThis should stay out of PR #548 unless it becomes required for correctness, because replacing the legacy bind readiness contract touches broader GAgent service command/query semantics.\n\nTarget design:\n- Make UpsertAsync ACK semantics explicit and honest.\n- Move readmodel readiness to an explicit observe/readiness contract, command observation, or binding-run readmodel.\n- Update legacy bind + immediate invoke callers to wait on that readiness signal instead of relying on command-path polling.\n- Preserve existing user-facing behavior: bind followed by invoke should not race serving-set materialization.\n\nScope guard:\n- Do not require changes in external repositories.\n- Do not broaden StudioMember async binding beyond the existing PR surface.\n- Keep current PR #548 complete without solving this derivative cleanup.
Follow-up from PR #548. The StudioMember async binding flow is functional and now completes through the binding-run actor continuation, but the legacy ScopeBindingCommandApplicationService still waits for service catalog and serving-set readmodels after issuing service lifecycle commands, using bounded polling before returning from UpsertAsync. That makes bind ACK semantics imply "readmodel observed / immediate invoke is safe", while coupling the command path to readmodel freshness and keeping Task.Delay polling in application logic.\n\nThis should stay out of PR #548 unless it becomes required for correctness, because replacing the legacy bind readiness contract touches broader GAgent service command/query semantics.\n\nTarget design:\n- Make UpsertAsync ACK semantics explicit and honest.\n- Move readmodel readiness to an explicit observe/readiness contract, command observation, or binding-run readmodel.\n- Update legacy bind + immediate invoke callers to wait on that readiness signal instead of relying on command-path polling.\n- Preserve existing user-facing behavior: bind followed by invoke should not race serving-set materialization.\n\nScope guard:\n- Do not require changes in external repositories.\n- Do not broaden StudioMember async binding beyond the existing PR surface.\n- Keep current PR #548 complete without solving this derivative cleanup.