Prod /arena/get_challenge_info capture (Season 26):
- reward_step_info.reward_step_list is a Dict<string,string>
({"5":"5","10":"10","15":"15"}), not the List<int> I'd assumed
- max_reward_step is stringified
The previous stub would have parsed at the client (LitJson tolerates the
shape via indexed iteration), but cleaning to match prod exactly.
Also stubs /arena/get_challenge_ranking_history (new endpoint observed
in the same capture). Prod ships {two_pick: [], sealed: []} with no
history populated — empty lists match. Routing smoke added.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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