Add `borg collect local` command to collect files from the local
filesystem into a DataNode.
Features:
- Walks directory tree (defaults to CWD)
- Respects .gitignore patterns by default
- Excludes hidden files by default (--hidden to include)
- Custom exclude patterns via --exclude flag
- Output formats: datanode, tim, trix, stim
- Compression: none, gz, xz
Examples:
borg collect local
borg collect local ./src --output src.tar.xz --compression xz
borg collect local . --format stim --password secret
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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