feat: add container-use package and fix goose-cli libclang dependency

- Add dagger/container-use (v0.4.2) for containerized coding agent environments
- Fix goose-cli build by adding llvmPackages.libclang for bindgen
- Clean up skillsmcp package (remove custom fastmcp override, use nixos-unstable)
- Remove broken update.py script from goose-cli
- Add treefmt.toml for consistent formatting
- Update README with all current packages

packages/skillsmcp/default.nix

@@ -1,4 +1 @@
-{ pkgs, ... }:
-pkgs.callPackage ./package.nix {
-  fastmcp = pkgs.callPackage ./fastmcp.nix { };
-}
+{ pkgs, ... }: pkgs.callPackage ./package.nix { }

packages/skillsmcp/fastmcp.nix

@@ -1,7 +0,0 @@
-{ python3Packages }:
-
-# Use fastmcp from nixpkgs but disable tests
-python3Packages.fastmcp.overrideAttrs (old: {
-  doCheck = false;
-  doInstallCheck = false;
-})

packages/skillsmcp/package.nix

@@ -2,7 +2,6 @@
   lib,
   python3Packages,
   fetchFromGitHub,
-  fastmcp,
 }:
 
 python3Packages.buildPythonApplication rec {
@@ -22,7 +21,7 @@ python3Packages.buildPythonApplication rec {
   ];
 
   dependencies = [
-    fastmcp
+    python3Packages.fastmcp
     python3Packages.pyyaml
   ];
 
@@ -30,12 +29,6 @@ python3Packages.buildPythonApplication rec {
   doCheck = false;
   pythonImportsCheck = [ "skillsmcp" ];
 
-  # Patch to accept fastmcp 2.x from nixpkgs
-  postPatch = ''
-    # Replace version requirement in pyproject.toml
-    sed -i 's/"fastmcp>=3.0.0"/"fastmcp>=2.0"/' pyproject.toml
-  '';
-
   passthru.category = "MCP Servers";
 
   meta = with lib; {