BUG: Use vol_model instead of vol for p type check in arch_model#834

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gjunjie wants to merge 2 commits intobashtage:mainfrom

gjunjie:fix-vol-model-check

Commits on Apr 3, 2026

BUG: Use vol_model instead of vol for p type check in arch_model
gjunjie
committed
TST: Update test to expect TypeError instead of AssertionError
gjunjie
committed