🌿 Fern Regeneration -- March 26, 2026

[fern-api]

This PR regenerates code to match the latest API Definition.

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Note

High Risk
Large Fern regeneration that rewires most clients/tests from github.com/cohere-ai/cohere-go/v2 to github.com/cohere-ai/cohere-go, updates SDK identification headers/versioning, and adds a new multipart audio transcription endpoint—high risk for breaking module/import compatibility and request behavior.

Overview
Fern regeneration updates SDK versioning and package wiring. Metadata and request headers are bumped (generator 1.31.4, SDK v0.2.1), and most generated clients/tests switch their types and error decoding from .../v2 imports to github.com/cohere-ai/cohere-go equivalents (plus some map[string]interface{} → map[string]any cleanups).

Adds new Audio API support. Introduces an Audio subclient on the root client.Client and a new audio/transcriptions client that performs POST /v2/audio/transcriptions as multipart form-data (file, model, language, optional temperature), along with corresponding error codes and wire/unit tests.

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