fix(zod): sanitize extracted definition refs

[FU-max-boop]

• I understand that this repository is auto-generated and my pull request may not be merged

Summary

• normalize whitespace to _ when zod v3 schemas extract reused definitions to root refs
• keep $ref values and definitions keys aligned after normalization
• add a regression test for reused schemas under property names containing spaces

Why

zodResponseFormat can currently produce $ref values such as #/definitions/example-scope_properties_group_properties_Thing With Spaces. Those literal spaces can be rejected by the API and make the generated schema harder to consume.

Fixes #1679.

Testing

• npx -y yarn@1.22.22 test tests/helpers/zod.test.ts --runInBand
• npx -y yarn@1.22.22 prettier --check src/_vendor/zod-to-json-schema/parseDef.ts tests/helpers/zod.test.ts
• npx -y yarn@1.22.22 eslint src/_vendor/zod-to-json-schema/parseDef.ts tests/helpers/zod.test.ts
• npx -y yarn@1.22.22 build
• git diff --check

[chatgpt-codex-connector]

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[HAYDEN-OAI]

@FU-max-boop thanks for tracking this down and for sticking with the collision-safe ref handling. appreciate your patience while we brought the branch current and worked through the recursive-schema edge case. merging now! 💚