DeepSeek Harness Compatibility Guard: dsh-upgrade-guard

`dsh-upgrade-guard` is a compatibility inspection plugin for DeepSeek Harness (DSH), designed to resolve startup failures caused by plugin incompatibilities after host upgrades. Operating as a resident daemon, it automatically checks the plugin’s `engines`, `peerDependencies`, and `cordis.patch.yml` configuration after a host upgrade, and supports one-click configuration cleanup and remediation. The plugin also allows custom Probes for self-diagnostics and provides “rescue” and “host rollback” capabilities: by using a Supervisor process, it can automatically disable faulty plugins or restore an older version when the host fails to start, ensuring system stability.