Bug

/caveman:compress runs, reports success, but:

1. File content unchanged (nearly identical to input — articles not dropped, fragments not used)
2. Backup .original.md written as empty file

Repro

/caveman:compress .github/prompts/task.md

Output: Validation passed / Compression completed successfully

Actual file: unchanged prose, full articles still present.
Backup: 0 bytes / 1 line empty.

Expected

Compressed caveman output overwrites original. Backup contains original content.

Environment

• Plugin version: 84cc3c14fa1e
• OS: Windows 11
• Shell: bash (Git Bash)
• Python: python3 via bash