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Migrate provider lookup tests to instance fixtures

Migrate provider env precedence, model lookup, and default model tests to Effect-aware instance fixtures while keeping behavior unchanged.
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Kit Langton committed
88681d389b32236299a0c2f78276f0759582aa60
Parent: ae2ecd1
Committed by GitHub <noreply@github.com> on 5/18/2026, 6:01:53 PM