🌿 Fern Regeneration -- March 11, 2026

[fern-api]

This PR regenerates code to match the latest API Definition.

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Note

Medium Risk
Removes public client methods (summarize/gist) and response types, which is a backward-incompatible API change for SDK consumers; new embedding request shapes add surface area but are mostly additive.

Overview
Bumps the SDK version to 1.2.1 (including updated User-Agent/X-Fern-SDK-Version) and refreshes dependencies (notably certifi).

Breaking change: removes the deprecated summarize and gist endpoints from both sync/async clients (BaseClient/RawBaseClient) and deletes the associated types (SummarizeResponse, Gist, GistRequestTypesItem), with reference.md updated accordingly.

Adds new embeddings capabilities: embed.v_2.create now supports input_type="multi_input" with new request/types (MultiInputRequest, MultiInputMediaSource) for up to 10 images (optionally with text references), and audio/video embedding requests gain an embedding_type option to request separate vs fused embeddings (plus a new fused embedding modality in responses). Documentation strings are updated to reflect multi-image search inputs, and Marengo 2.7 deprecation messaging is propagated across embed/index/search docs.

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