refactor: archive GUI clients; keep minimal TUI with hooks/API

Move Qt/Tauri/full Web SPA under archive/, ship hermit as CLI/TUI plus
libcstcore and cst-webui/1 HTTP+SSE (turn lifecycle hooks, capabilities).

Co-authored-by: Cursor <cursoragent@cursor.com>

archive/qt-app/qml/NoteLine.qml

@@ -0,0 +1,29 @@
+import QtQuick
+import QtQuick.Layouts
+
+// A one-line note from the engine (status text, a refusal, a hint).
+RowLayout {
+    id: note
+    property string text: ""
+    property string level: "info"   // info | warn | error
+    spacing: Theme.gap
+
+    Rectangle {
+        Layout.alignment: Qt.AlignTop
+        Layout.topMargin: 6
+        width: 5
+        height: 5
+        radius: 3
+        color: note.level === "error" ? Theme.err
+             : note.level === "warn" ? Theme.warn : Theme.textFaint
+    }
+    Text {
+        Layout.fillWidth: true
+        text: note.text
+        color: note.level === "error" ? Theme.err
+             : note.level === "warn" ? Theme.warn : Theme.textDim
+        font.pixelSize: Theme.smallSize
+        wrapMode: Text.Wrap
+        textFormat: Text.PlainText
+    }
+}