Create /app/backup.py that implements a checksum-verified backup tool with the following CLI interface:

Create /app/backup.py that implements a checksum-verified backup tool with the following CLI interface:: a task in TermGrade Environments: 1,004 executable Linux tasks (Harbor dataset). create command: - Recursively walk <source dir , collecting every regular file (not symlinks, not directories…

The task

**`create` command:** - Recursively walk `<source_dir>`, collecting every regular file (not symlinks, not directories, not special files). - Files MUST be processed in a deterministic, sorted order: by relative path using ASCII/byte-order comparison (not locale-aware). - The backup format is a single binary file…

Part of ai-and/termgrade-environments.