git-rain: versionet e vjetra dhe historiku

Changelog
New Features
- a6d12fc feat(cli): default mainline fetch, --rain TUI, --sync hydrate
- 5ea771c feat(cmd): parallel default run with streaming scan (#6)
- 265e6e7 feat(install): first-party curl installer for Linux/macOS (#3)
Bug Fixes
- 9dc5de7 fix(git): mainline fetch filters on upstream branch name; ambiguous infer is skip
- 0fbbe46 fix(uat): scenario 9 needs --sync for local branch fast-forward
Other
- 95f0929 Default to fetch-all; add --mainline-fetch (#4)
- 3bec360 docs(readme): behavior accuracy, dry-run note, config vs registry locking (#5)
- 1eb4d16 refactor stuff
Install
Go
go install github.com/git-rain/git-rain@v0.9.2
curl (Linux / macOS)
curl -fsSL https://raw.githubusercontent.com/git-fire/git-rain/v0.9.2/scripts/install.sh | VERSION=v0.9.2 bash
Homebrew (macOS/Linuxbrew)
brew install git-fire/tap/git-rain
Windows (WinGet)
The package is available in WinGet only after the microsoft/winget-pkgs update PR for this version is merged.
Until then, install from the Windows .zip asset attached to this release.
winget install git-rain.git-rain
Linux packages
Download and install .deb or .rpm assets from this release.
Full instructions: README -> Install