Honor keepLoaded for services during plugin hot-reload (#9485)

* Honor keepLoaded for services during plugin hot-reload

Plugin reload destroyed every service, including omarchy.lock, which drops the ext-session-lock client while Hyprland still holds the lock and surfaces the crashed-lockscreen fallback.

* Prove keepLoaded service survival with a fixture service

A fresh lock service also reports an empty lastEventAt, so comparing it
across the rescan passed whether or not the instance survived. A fixture
keepLoaded service whose in-memory marker is set before the rescan and
read back after can only pass when the same instance is still mounted.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Drop kept services whose plugin no longer declares a service

The _syncServices cleanup only asked whether the plugin was still
installed and enabled, so a kept service whose plugin dropped its
service kind or entry point kept running as a zombie until shell
restart. Apply the same eligibility checks used at creation, and hand
kept instances the refreshed manifest after a rescan.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Cover omarchy.media in keepLoaded expectations; note kept services reload on restart

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: David Heinemeier Hansson <david@hey.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

test/shell.d/plugins-test.sh

@@ -197,5 +197,18 @@ for (const [id, section] of Object.entries({
 }
 check(byId['omarchy.media']?.barWidget?.defaultSection === undefined, 'omarchy.media must use the center fallback')
 
+for (const id of ['omarchy.lock', 'omarchy.idle', 'omarchy.polkit', 'omarchy.notifications', 'omarchy.media']) {
+  check(byId[id]?.keepLoaded === true, `${id} must stay loaded across plugin reloads`)
+}
+
+const shellSource = fs.readFileSync(path.join(root, 'shell/shell.qml'), 'utf8')
+const unloadMatch = shellSource.match(/function unloadPluginServices\(\) \{[\s\S]*?\n  \}/)
+check(!!unloadMatch, 'unloadPluginServices is defined')
+check(!!unloadMatch && /serviceKeepLoaded/.test(unloadMatch[0]), 'unloadPluginServices honors keepLoaded')
+check(
+  /function _syncServices\(\) \{[\s\S]*Drop services for plugins that have been disabled/.test(shellSource),
+  '_syncServices still drops disabled or removed services'
+)
+
 assert(errors.length === 0, 'plugin manifests match shell registry contract', errors.join('\n'))
 JS