Clean up template files during/after Simone init

[Helmi]

Description

The init_simone command currently copies template files (architecture.md.template, constitution.md.template, project.yaml.template) to create the actual configuration files, but leaves the template files behind. This creates unnecessary clutter in the .simone/ directory.

Context

• Project area: MCP Server implementation
• Complexity: 4/10 (moderate)
• Current behavior: Templates are copied to create actual files, templates remain in place
• Expected behavior: Templates should be moved/renamed instead of copied, or cleaned up after use

Technical Details

Affected files:

• /mcp-server/src/templates/prompts/init_simone.yaml:55-57, 106-108, 130-132 - Template copy logic
• /hello-simone/install-mcp.js:167-219 - Initial template download (working correctly)
• Template files location: /mcp-server/templates/*.template

Requirements

1. For new projects: When init_simone creates configuration files from templates, it should move/rename the templates instead of copying them
2. For existing projects: When running init_simone on a project that already has both the real files and templates:
   • Detect the presence of both files
   • Ask the user if they want to clean up the template files
   • Remove templates if user confirms

Implementation Steps

• Update init_simone.yaml prompt to use move/rename operations instead of copy
• Add logic to detect leftover template files in existing projects
• Implement user confirmation prompt for template cleanup
• Test with both new project initialization and existing project updates
• Update any related documentation if needed

Acceptance Criteria

• Running init_simone on a new project results in no .template files remaining after completion
• Running init_simone on an existing project with leftover templates prompts for cleanup
• User can choose to keep or remove template files when prompted
• The hello-simone installer continues to download templates as before
• All tests pass and no regressions are introduced