fix(pi): discover ancestor project resources

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

@@ -13,6 +13,7 @@ let
   piDir = "${config.users.users.${user}.home}/.pi/agent";
   patchedPi = pkgs.pi-coding-agent.overrideAttrs (old: {
     patches = (old.patches or [ ]) ++ [
+      ./patches/pi-project-resource-ancestors.patch
       ./patches/pi-tool-lookup-validation.patch
     ];
   });
@@ -44,12 +45,6 @@ in
         # The first declarative rollout replaces the interactive settings file.
         # Login state stays in auth.json, which this module does not manage.
         "${piDir}/settings.json".force = true;
-
-        "${piDir}/extensions" = {
-          source = ./extensions;
-          recursive = true;
-          force = true;
-        };
       };
     };
   };