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>

default.nix

@@ -1,7 +1,7 @@
-# NixOS and other nix users: legacy Qt Quick front end (frozen; Tauri app is
-# apps/desktop). CLI remains scripts/bootstrap_linux.sh.
+# NixOS: archived Qt Quick front end (archive/qt-app). Prefer hermit CLI via
+# scripts/bootstrap_linux.sh. Desktop Tauri reference: archive/desktop-tauri.
 #
-#   nix-build                  # ./result/bin/hermit-app (Qt, transitional)
+#   nix-build                  # ./result/bin/hermit-app (Qt, frozen)
 #   nix-env -f . -i hermit
 { pkgs ? import <nixpkgs> { } }:
 
@@ -57,7 +57,7 @@ pkgs.stdenv.mkDerivation {
   cmakeFlags = [ "-DCST_BUILD_APP=ON" "-DCMAKE_BUILD_TYPE=Release" ];
 
   # The "app" component is the window, its launcher entry and the icon;
-  # app/CMakeLists.txt is the one place that knows where each goes.
+  # archive/qt-app/CMakeLists.txt is the one place that knows where each goes.
   installPhase = ''
     runHook preInstall
     cmake --install . --component app --prefix "$out"
@@ -86,7 +86,7 @@ pkgs.stdenv.mkDerivation {
 
   meta = {
     description =
-      "Hermit: local coding agent (legacy Qt Quick front end; prefer apps/desktop)";
+      "Hermit: archived Qt Quick front end (prefer CLI TUI + --web API)";
     homepage = "https://git.whcself.xyz/WHC/Hermit";
     platforms = pkgs.lib.platforms.linux;
     mainProgram = "cst-agent-app";