revert(nixos): undo bad system update

Restore the pre-update Pi packaging and Rofi option from PR 124 after the associated deployment exposed a performance regression.

Refs: 1b4dc7762

configs/nixos/modules/shell/pi/default.nix

@@ -8,7 +8,7 @@
 # home-manager, which ships the package and manages global settings.
 # The login credential is left unmanaged, so it survives rebuilds.
 let
-  user = config.user.name; # NOLINT(let_order)
+  user = config.user.name;
   piDir = "${config.users.users.${user}.home}/.pi/agent";
 in
 {
@@ -20,78 +20,9 @@ in
     home-manager.users.${user} = {
       programs.pi-coding-agent = {
         enable = true;
-        package = pkgs.buildNpmPackage {
-          pname = "pi-coding-agent";
-          version = "0.85.1";
+        package = pkgs.pi-coding-agent.overrideAttrs {
           src = ../../../../../third_party/pi;
-          npmDepsHash = "sha256-jzlsZIQzfl1FCZZ5//dHFWwMfBZQ4nRD6KB4HHifPqE=";
-          npmWorkspace = "packages/coding-agent";
-          npmRebuildFlags = [ "--ignore-scripts" ];
-          dontNpmPrune = true;
-
-          preConfigure = ''
-            mkdir -p packages/ai/src/providers/data
-            tar --extract --gzip \
-              --file=${
-                pkgs.fetchurl {
-                  url = "https://registry.npmjs.org/@earendil-works/pi-ai/-/pi-ai-0.85.1.tgz";
-                  hash = "sha256-r30RmGF5RFzm/oizfVfeIvgjwP/TplyuMcVVt/XpklM=";
-                }
-              } \
-              --directory=packages/ai/src/providers/data \
-              --strip-components=4 \
-              package/dist/providers/data
-          '';
-
-          buildPhase = ''
-            runHook preBuild
-            npm run build:offline
-            runHook postBuild
-          '';
-
-          preInstall = ''
-            npm prune --omit=dev --no-save
-          '';
-
-          postInstall = ''
-            local nm="$out/lib/node_modules/pi-monorepo/node_modules"
-
-            for ws in @earendil-works/chord:packages/chord \
-                      @earendil-works/pi-ai:packages/ai \
-                      @earendil-works/pi-agent-core:packages/agent \
-                      @earendil-works/pi-client:packages/client \
-                      @earendil-works/pi-protocol:packages/protocol \
-                      @earendil-works/pi-telemetry:packages/telemetry \
-                      @earendil-works/pi-tui:packages/tui; do
-              IFS=: read -r pkg src <<< "$ws"
-              rm "$nm/$pkg"
-              cp -r "$src" "$nm/$pkg"
-            done
-
-            find "$nm" -type l -lname '*/packages/*' -delete
-            find "$nm/.bin" -xtype l -delete
-          '';
-
-          nativeBuildInputs = [ pkgs.makeBinaryWrapper ];
-          postFixup = ''
-            wrapProgram "$out/bin/pi" --prefix PATH : ${
-              lib.makeBinPath [
-                pkgs.ripgrep
-                pkgs.fd
-              ]
-            } \
-              --set-default PI_SKIP_VERSION_CHECK 1 \
-              --set-default PI_TELEMETRY 0
-          '';
-
-          doInstallCheck = true;
-          nativeInstallCheckInputs = [
-            pkgs.writableTmpDirAsHomeHook
-            pkgs.versionCheckHook
-          ];
-          versionCheckKeepEnvironment = [ "HOME" ];
-          versionCheckProgram = "${placeholder "out"}/bin/pi";
-          versionCheckProgramArg = "--version";
+          patches = [ ];
         };
 
         settings = {