Add Panama health state service

config/dot/quickshell/health-harness.qml

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+import Quickshell
+import Quickshell.Io
+import QtQuick
+
+import qs.services
+
+ShellRoot {
+    // The production singleton still performs its delayed startup scan. The
+    // harness turns it off before its 2200 ms deadline so each fixture drives
+    // only the state transition it is asserting.
+    Component.onCompleted: Health.startupScanEnabled = false
+
+    IpcHandler {
+        target: "health-test"
+
+        function accept(text: string, generation: int): bool { return Health.consumeSnapshot(text, generation); }
+        function queue(): void { Health.refresh(); Health.refresh(); }
+        function status(): string { return JSON.stringify(Health.diagnostics()); }
+        function repair(id: string): bool { return Health.repair(id, false); }
+    }
+}