Update version-guard to v1.1.0 (#2318)

- Version: 1.0.0 → 1.1.0
- Commands: 1 → 3 (check, load, validate)
- Hooks: 2 → 4 (before_plan, before_tasks, before_implement, after_implement)
- Added: persistent constraints artifact, two-channel model, CVE detection,
  decision record fallback for greenfield projects, skip artifact persistence

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>