- Moved sanitizeSchemaForStrictMode, enforceStrictSchema, and tryEnforceStrictSchema into normalize.ts.
- Moved sanitizeSchemaForOpenAIResponses/rewriteOneOfToAnyOf into normalize.ts alongside other normalizers.
- Removed strict-mode.ts and its public re-export; adapt.ts now only exposes NO_STRICT and adaptSchemaForStrict.
- Dropped StringEnum helper from strict-mode.ts (already removed from public API).