repoclean v0.8.0: gatekeeper + tracked junk + staged-only workflow

v0.7.0 Junk cleanup becomes automatic + hook becomes repo-hygiene enf…

…orcer

v0.6.0 Better secrets scanning

Release v0.5.2: fix tomli dependency

Release v0.5.1: fix Windows hook execution

Release v0.5.0: hook modes and hook utilities

Release v0.4.0: CI mode and scan gating

Release v0.3.0: config support and ignore rules

Update README with install/usage and why section

Rename package to repoclean-cli and bump version