Documents the git-sync prod incident where the plugin was inert despite
`enabled: true`, because its CODE was missing from user/plugins/git-sync/
while its CONFIG survived in the per-host env tree. Fix: GPM reinstall
(make remote-gpm-install-prod PKG=git-sync) + clearcache. Captures the
diagnostic (ls the plugin dir before touching config) and the remote-only
plugin caveat (not in plugins.txt, not restored by the standard flows).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Np4cMQLF77i664CAQXySzU
