PluginStore.updatePluginState rejects same-state transitions, so the
autoload at startup error'd with "Invalid state transition from
started to started" for every plugin whose persisted state was
"started" from a previous container generation. The new process has
no in-memory instance yet, so the right thing is to flip the
persisted state back to "installed" before loadAllPlugins() walks
the registry; loadPlugin() then drives the state machine forward to
"started" cleanly.
This unblocks the plugin route mount for telemetry-watcher.
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