Refactor pi plan mode

modules/home/pi.nix

@@ -3,6 +3,7 @@
 let
   cfg = config.dot.pi;
   piPath = "${config.dot.dotfilesPath}/modules/pi/agent";
+  piWorkMode = config.dot.llm.pi.workMode or false;
 in
 {
   options.dot.pi = {
@@ -12,14 +13,15 @@ in
   };
 
   config = lib.mkIf cfg.enable {
-    # Out-of-store symlinks so the files stay editable without a nix rebuild.
-    # Only the managed files are linked; pi's runtime files (auth.json,
-    # sessions/, models-store.json) are left untouched in ~/.pi/agent.
     home.file = {
       ".pi/agent/settings.json".source =
-        config.lib.file.mkOutOfStoreSymlink "${piPath}/settings.json";
+        config.lib.file.mkOutOfStoreSymlink
+          "${piPath}/${if piWorkMode then "settings.work" else "settings.home"}.json";
       ".pi/agent/extensions".source =
-        config.lib.file.mkOutOfStoreSymlink "${piPath}/extensions";
+        config.lib.file.mkOutOfStoreSymlink "${piPath}/extensions-common";
+    } // lib.optionalAttrs piWorkMode {
+      ".pi/agent/extensions-work".source =
+        config.lib.file.mkOutOfStoreSymlink "${piPath}/extensions-work";
     };
   };
 }