Preserve Gemma tool types and response whitespace

[mattt]

Gemma tool declarations could describe nested argument types as strings, and transcript replay converted structured arrays and scalar tool results into quoted strings. This follow-up to #227 addresses all three comments from Copilot's re-review.

Gemma now explicitly rejects unsupported anyOf, oneOf, and allOf schemas at the root, in properties, and in array items, addressing the latest review.

[Copilot]

🟡 Changes recommended

Referenced union schemas are still silently rendered as strings or empty parameter schemas.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Preserves Gemma schema types, structured tool-result types, and response whitespace during Llama transcript rendering.

Changes:

• Recursively resolves Gemma schema references.
• Preserves structured and mixed tool-output segment types.
• Aligns completed-response whitespace handling and expands tests.

File summaries

File	Description
Sources/AnyLanguageModel/Models/LlamaToolCallFormat.swift	Resolves schemas and renders typed tool responses.
Sources/AnyLanguageModel/Models/LlamaLanguageModel.swift	Preserves output whitespace and passes typed segments.
Tests/AnyLanguageModelTests/LlamaToolCallFormatTests.swift	Tests nested schemas, whitespace, and typed responses.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 1
• Review effort level: Balanced

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