Add custom claude-cli package to bypass npm registry restrictions

Create custom Nix package for Claude Code CLI that fetches directly from
Anthropic's Google Cloud Storage distribution instead of npm registry,
working around Block's Cloudflare Teams dependency confusion protection.

- Add claude-cli package with platform-specific binaries
- Include comprehensive README with update instructions
- Enable development role on work machine
- Switch from unstable.claude-code to custom.claude-cli
- Add google-cloud-sdk to work machine packages

packages/default.nix

@@ -3,4 +3,5 @@
   vulkanHDRLayer = pkgs.callPackage ./vulkan-hdr-layer {};
   tea-rbw = pkgs.callPackage ./tea-rbw {};
   app-launcher-server = pkgs.callPackage ./app-launcher-server {};
+  claude-cli = pkgs.callPackage ./claude-cli {};
 }