- Add TimeAgo(t time.Time) for relative time strings
- Add FormatAgo(count, unit) for "N units ago" composition
- Add i18n.ago namespace pattern: T("i18n.ago", 5, "minute")
- Uses existing time.ago.{unit} keys with CLDR pluralization
- Remove local formatTimeAgo from cmd/php in favor of i18n.TimeAgo
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
