A `claude plugin update` run from a terminal (or with only the Claude desktop
app open) unpacks the new build and starts nothing: no SessionStart fires, so
the dashboard kept running the old cache dir across reboots, and with the
forge unreachable the sidebar read "Up to date" (seen on a machine stuck at
1.8.10).
- pluginStatus asks supersededBy for its own root: a recorded sibling install
sets `installed_not_running: {root, version}` and `update_available`, with
no network needed
- the sidebar reads "<version> installed, not running"; the update modal keys
on it, so Update now is offered even with no release tag or sha
- plugin-update-helper hands over to the recorded install first, the newest
sibling dir only as a fallback
- a plugin install whose release lookup failed reads "Could not check for
updates" instead of "Up to date"
- docs/PLUGINS.md: the case and the manual hand-over command
nntrivi2001
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