feat(competition): challenger kit restoring the auto backend

[plind-junior]

round-1 ladder entry: restore backend: auto over the round-0 canary champion (substring).

local precheck with the gate's own scorer (.github/scripts/koth_score.py) at base sha 7243bd5, utc 2026-07-27: champion mean 0.20, challenger mean 0.55, paired diff +0.35 against a band of max(0.007, 1.96 x SE) = 0.0295 — dethrones on all 12 derived seeds.

reproduce:

python .github/scripts/koth_score.py \
  --champion competition/kits/current/kit.yaml \
  --challenger kit-from-this-pr.yaml \
  --base-sha <base tip> --date <utc date>

kit-only change, as the ladder requires. expected gate behaviour: classify as ladder PR, validate against the allowlist, run paired scoring, post the scorecard comment, verdict dethroned, enable squash auto-merge (base is the KOTH_LADDER_BASE branch).

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[github-actions]

koth ladder - dethroned

{
 "date": "2026-07-27",
 "base_sha": "881127250ba3a680615d99bf73ab4376acfdcb69",
 "seeds": [
  90813253984371,
  164084902193554,
  261359132532710,
  255327968308077,
  88737840794468,
  76942358585422,
  142842187877729,
  97581596516071,
  157100008129172,
  46217966697507,
  46815146570875,
  10927681347214
 ],
 "champion": {
  "scores": [
   0.2,
   0.2,
   0.2,
   0.2,
   0.2,
   0.2,
   0.2,
   0.2,
   0.2,
   0.2,
   0.2,
   0.2
  ],
  "mean": 0.2
 },
 "challenger": {
  "scores": [
   0.5,
   0.6,
   0.5,
   0.6,
   0.5,
   0.6,
   0.5,
   0.6,
   0.5,
   0.6,
   0.6,
   0.7
  ],
  "mean": 0.5666666666666667
 },
 "mean_diff": 0.36666666666666664,
 "se": 0.01880253582725887,
 "band": 0.03685297022142739,
 "dethroned": true
}

auto-merge on dethrone (provisional ladder branch).

seeds derive from base sha + utc date; rerun locally with
python .github/scripts/koth_score.py --date <utc-date> to reproduce.
the daily result is provisional and overfittable - payout rank is
settled monthly on sealed commit-reveal seeds (docs/vouchbench-seasons.md).