v1.7.0

• Added manifest mode to generate metadata-only file entries, omitting file
  content to reduce context size
• Implemented a native TOON v4.4 encoder, replacing the toon-ruby dependency
• Added size and tokens fields to command output entries
• Restructured file content to use a line-numbered tabular format
• Updated size formatting to use IEC units with one decimal place
• Added -m flag to the CLI for manifest mode and -F flag for selecting
  output format (JSON or TOON)
• Removed toon_example metadata injection from TOON output