Adds a reviewable in-app install path for Hermes plugins:
hermes://plugin/install?repo=owner/repo (and Settings -> Plugins ->
Install from Git) opens a confirmation modal showing the repo identity
and source links, shallow-clones to probe for agent and/or desktop
plugin artifacts, lets the user pick components, then installs — agent
side through the gateway's new plugins.manage `install` action (wrapping
the existing dashboard_install_plugin), desktop side through a new
Electron git-install module with subdir-escape guards, a 60s clone
timeout, non-interactive git env, and insecure-scheme warnings. Never
auto-installs; hybrid repos get one dialog. Legacy plugin-agent /
plugin-desktop deeplinks route into the same modal.
Salvaged from PR #82735 by @serefyarar (net diff applied onto current
main as a single authored commit; the branch carried merge commits).
The preview screenshot PNG from the original branch was intentionally
not carried over — images live in PR bodies, not the repo.
hermes-seaeye[bot]