internal/mcp → pkg/mcp (MCP client, concrete)
internal/tools → pkg/tools (Executor interface + MCPExecutor)
internal/exec → pkg/tools/execute (builtin sandbox executor, split by tool)
Split exec.go into executor.go (sandbox runner), pipe.go (BuildPipeline/PipeStep),
tool.go (ReadTool), and code.go (execute_code is Executor.Execute with trusted=false).
All three packages are now importable by consumers outside this module.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Levi Neely