- Use `variant is None` instead of `not variant` to avoid skipping
variant 0 tier-ups (0 is falsy in Python)
- Remove unused `team` parameter from _build_refractor_response
- Update tests to match
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds optional refractor_tier parameter to the /player slash command.
When provided: looks up the user's team refractor data, shows the
evolved card image if available, triggers on-demand render if image
not yet generated, or shows top 5 refractor cards as fallback.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
