harmony/fleet/agent-upgrade-stop-switch-start-plan.md

Fleet agent upgrade: stop, switch, start

Status

Implemented. This plan replaced the signed two-step authorization protocol for the IoT Podman fleet agent.

The maintained documents are:

• docs/adr/022-fleet-agent-upgrade.md for the decision and invariants;
• docs/design/fleet-agent-upgrades.md for the current protocol, recovery behavior, limits, and operational caveats;
• harmony-reconciler-contracts/src/upgrade.rs for wire fields and phases;
• fleet/harmony-fleet-agent/src/updater.rs for the local transaction.

This file is retained so links from the implementation work remain valid. It is not an independent protocol specification.