🌿 Fern Regeneration -- February 11, 2026

[fern-api]

This PR regenerates code to match the latest API Definition.

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Note

Medium Risk
Changes touch core request/auth and HTTP retry/url building logic, which can affect runtime behavior for all API calls (especially base URLs with path prefixes and token handling). Most other diffs are regenerated types/docs and dependency bumps.

Overview
Regenerates the SDK to 5.20.5 with updated Fern tooling (.fern/metadata.json) and refreshed docs (reference.md) that now show explicit AsyncHttpResponse[...] return types.

Client initialization and auth behavior changed: both sync and async clients now raise an ApiError if no token is provided (or CO_API_KEY is unset), and request wrappers always attach an Authorization header; async clients also gain optional async_token support for dynamically awaiting tokens.

HTTP transport behavior changed: URL construction switches away from urljoin to preserve base URL path prefixes, multipart/form bodies now drop None fields, query params avoid passing empty lists to httpx, retry timing/backoff is reworked (includes Retry-After/X-RateLimit-Reset handling + jitter, different caps) and default retry counting/max_retries handling is adjusted.

Type surface is updated (e.g., several *ContentItem exports renamed to *ContentOneItem, CancelBatchResponse values become non-optional Any, and raw clients cast error bodies to Any), and dev tooling adds pytest-xdist plus lockfile dependency updates.

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