Closes#144
- build_tier_up_embed() accepts optional image_url and calls set_image() when provided
- notify_tier_completion() accepts optional image_url and passes it through
- _trigger_variant_renders() now captures the render response image_url per player and returns a player_id->image_url dict
- _run_post_game_refractor_hook() triggers renders first (to obtain image URLs), then sends notifications with card art included
- Updated test_post_game_refractor_hook.py to reflect new render-before-notify ordering and image_url kwarg in notify calls
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
