Pass metadata into toolPart to allow multi step tool calls for @effect/ai-google

[izakfilmalter]

…

Type

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update

Description

Prompt.fromResponseParts doesn't copy metadata to options when converting Response.ToolCallPart and Response.ToolResultPart to prompt parts.
This breaks multi-turn tool calls with Google's Gemini API, which requires thoughtSignature (stored in metadata.google.thoughtSignature) to be present in follow-up requests. Without this fix, Gemini returns a 400 error: "Function call is missing a thought_signature in functionCall parts."
The fix adds options: part.metadata when creating tool-call and tool-result parts in fromResponseParts.

Related

• Related Issue #
• Closes fromResponseParts drops metadata when converting tool-call/tool-result parts #5954

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