v1.1.1: Release Packaging and Catalog Update

Parent epic: #14

## Scope
- Bump extension/package versions to 1.1.1
- Generate immutable version pack chromium-extension-versions/v1.1.1
- Update CATALOG.json and release notes
- Preserve previous immutable packs untouched

## Acceptance
- v1.1.1 pack loadable from catalog
- release notes include v1.1.1 highlights
- rollback to v1.1.0 documented