🌿 Fern Regeneration -- April 8, 2026

[fern-api]

This PR regenerates code to match the latest API Definition.

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Note

Medium Risk
Medium risk due to a major version bump plus changes to default async client selection and HTTP retry behavior, which can affect request execution and error handling. Dependency and CI/runtime minimums also shift to Python 3.10, potentially impacting downstream compatibility.

Overview
Upgrades the generated SDK to v6.0.0 (new Fern generator/CLI), bumps the minimum supported Python version to 3.10, and refreshes dependencies accordingly.

Adds an optional aiohttp transport (cohere[aiohttp]) via httpx-aiohttp, including new default async client helpers (DefaultAioHttpClient, DefaultAsyncHttpxClient) and an async_token option for async token retrieval.

Improves HTTP resiliency by making sync/async request retries configurable via a base default and retrying on connection/protocol errors (in addition to existing status-code-based retries), and updates pydantic utilities to avoid importing pydantic.v1 for Python 3.14 compatibility. Also refreshes docs/examples and CI to test on Python 3.10 with parallelized pytest plus an extra aiohttp test run.

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