chore: remove goose-cli package and cleanup configuration

- Delete packages/goose-cli/ (librusty_v8 pre-built binary dependency)
- Remove global nixpkgs.config.allowUnfree from flake.nix
  (goose-cli was the only package requiring unfree binaries)
- Add .claude/ to .gitignore
- Update README.md and AGENTS.md to remove all goose-cli references

README.md

@@ -16,7 +16,6 @@ A custom Nix overlay and flake providing additional packages not found in upstre
 | `container-use` | Containerized environments for coding agents | AI Coding Agents |
 | `desloppify` | Multi-language codebase health scanner and technical debt tracker for AI agents | AI Coding Agents |
 | `freebuff` | The world's strongest free coding agent | AI Coding Agents |
-| `goose-cli` | CLI for Goose - a local, extensible, open source AI agent that automates engineering tasks | AI Coding Agents |
 | `graphify` | Turn any folder of code, docs, papers, images, or videos into a queryable knowledge graph | AI Coding Agents |
 | `hipengine` | ROCm-native local LLM inference engine with torch-free runtime for AMD RDNA GPUs | AI Inference |
 | `mcp-gateway` | Universal Model Context Protocol gateway that sits between AI client and MCP tools/servers | MCP Servers |
@@ -74,10 +73,10 @@ With flakes enabled:
 
 ```bash
 # Try a package
-nix run git+https://git.millerson.name/alex/millerson-overlay.nix.git#goose-cli
+nix run git+https://git.millerson.name/alex/millerson-overlay.nix.git#mcp-gateway
 
 # Install permanently
-nix profile install git+https://git.millerson.name/alex/millerson-overlay.nix.git#goose-cli
+nix profile install git+https://git.millerson.name/alex/millerson-overlay.nix.git#mcp-gateway
 ```
 
 ## Development
@@ -94,7 +93,7 @@ nix profile install git+https://git.millerson.name/alex/millerson-overlay.nix.gi
 nix build .#packages
 
 # Build specific package
-nix build .#goose-cli
+nix build .#mcp-gateway
 
 # Enter development shell
 nix develop
@@ -116,7 +115,6 @@ nix-overlay/
 │   ├── desloppify/             # Codebase health scanner for AI agents
 │   ├── flake-inputs/           # Utility for caching flake inputs
 │   ├── freebuff/               # Free coding agent (Codebuff)
-│   ├── goose-cli/              # Goose AI agent CLI
 │   ├── graphify/               # Knowledge graph generator for code folders
 │   ├── hipengine/              # ROCm-native LLM inference engine for AMD GPUs
 │   ├── kubernetes-mcp-server/  # MCP server for Kubernetes and OpenShift