pstack: honor cross-judge model inheritance

Author: cursoragent

pstack/skills/arena/SKILL.md

@@ -38,7 +38,7 @@ If a candidate fails to produce output, proceed with N-1 and note the dropout in
 
 ## Phase C: Cross-judge
 
-After all Phase B candidates complete, spawn one readonly judge subagent on a different model family from the parent's. It sees the rubric and the candidates by path label, scores each criterion, and recommends a base with rationale. It runs in parallel with the parent's reading in Phase D, not with the candidates themselves. Spawning while candidates are still writing means the judge sees partial or empty outputs and reports them as dropouts.
+After all Phase B candidates complete, choose one entry from your configured `arena cross-judge pool`, preferring one whose resolved model family differs from the parent's. Resolve entries per `~/.cursor/rules/pstack-models.mdc`: pass the selected real slug as `model`, or omit `model` when the selected entry is `inherit-parent`/`auto`. If the role line is absent, use defaults `claude-opus-4-8-thinking-xhigh`, `gpt-5.5-high-fast`, `grok-4.5-fast-xhigh`. Spawn that readonly judge subagent. It sees the rubric and the candidates by path label, scores each criterion, and recommends a base with rationale. It runs in parallel with the parent's reading in Phase D, not with the candidates themselves. Spawning while candidates are still writing means the judge sees partial or empty outputs and reports them as dropouts.
 
 ## Phase D: Pick a base