throw on error

[sami-polymarket]

Note

Medium Risk
Changes core request/response behavior by optionally throwing exceptions, which can alter consumer control flow if enabled; default behavior remains unchanged.

Overview
Adds an opt-in throwOnError flag to ClobClient that converts API error-shaped responses (objects with an error field) into thrown ApiErrors across get/post/put/del, while preserving the current behavior by default.

Introduces and exports the new ApiError type, documents the new error-handling mode in README.md, adds tests covering thrown vs returned errors, and bumps the package version to 5.2.4.

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