/init

Initialize new Go project with Makefile and build structure

# Initialize Go Project

Initialize a new Go project with user-selected structure.

Use the Task tool to launch the **developer** agent with instructions:

1. Ask user for project name and module path
2. Ask user to select project structure:
   - Standard layout (golang-standards)
   - Hexagonal architecture
   - Flat structure (simple)
3. Create directory structure (including `bin/` directory)
4. Initialize go.mod
5. Create main.go with basic structure
6. **REQUIRED: Create Makefile** with:
   - `build` target (builds to `./bin/` directory)
   - `run` target
   - `test` target
   - `fmt` t...