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A harness spawned with BUZZ_ACP_SETUP_PAYLOAD runs as a nudge-only setup listener and never re-evaluates its config — readiness is only computed at spawn. Fixing the missing model/provider in Edit Agent therefore changed nothing: the stale setup-mode process stayed connected to the relay and kept replying "needs configuration" to every mention, with no hint that a restart was required. Stamp was-spawned-in-setup-mode on the in-memory ManagedAgentProcess at spawn time (runtime-only, never persisted), and in update_managed_agent stop + respawn the process when the edit makes the record pass readiness — inside the same store-lock section the save already holds, reusing stop_managed_agent_process / start_managed_agent_process. The respawn is best-effort: a failure is surfaced via record.last_error and never fails the save itself. Healthy (non-setup-mode) processes keep the existing "takes effect on next spawn" contract and the needs_restart badge. The readiness gate lives in setup_mode_now_ready, which mirrors the spawn-time computation (effective harness resolution + effective env), with unit tests covering fixed config, still-missing model, still-missing credential, and the non-setup-mode no-op. Co-authored-by: Bradley Axen <baxen@squareup.com> Signed-off-by: Bradley Axen <baxen@squareup.com>