/restructure

Restructure an existing project into the standard directory/file blueprint with backups.

## Goal
Upgrade an existing project to the canonical layout while preserving data by creating a timestamped backup and normalizing directories.

## Preparation
1. Gather `root` (project path), `backup` (default true), `remove_nonstandard` (default true), and `force` flags.
2. Verify the directory exists via `ls "$root"`; abort with actionable error if missing.
3. Load required directories/files from `config/marketplace-config.json -> project-management.standard_structure`.

## Execution
1. **Backup (if enabled)**
   
   Report backup path.
2. **Create missing directories**
   Loop through r...