gitgrip 1.0.0

Multi-repo workflow tool - manage multiple git repositories as one
Documentation
## Summary

Brief description of changes.

## Premium Boundary

Premium boundary: grip is OSS because <reason>.

## Changes

- Change 1
- Change 2

## Testing

How were these changes tested?

## Boundary Checklist

- [ ] Premium boundary declaration present
- [ ] Identity test passed (no "who is this agent?" code in OSS)
- [ ] Plugin seam built before premium extension
- [ ] No workspace metadata parsing, identity derivation, or premium prefixes

## General Checklist

- [ ] Code compiles
- [ ] Linting passes
- [ ] Tests pass
- [ ] Documentation updated (if applicable)