Update mlx-swift-lm

[atdrendel]

• Add Gemma 3 model support (only 12B works at the moment because of remaining mlx-swift-lm bugs)
• Pass tool schemas into MLXLMCommon.generate() to ensure function argument types are coerced into the types expected by the tools
• Add verbose flags to build and test scripts

[Copilot]

Pull request overview

Updates SHLLM’s MLX dependencies and expands model/tooling support, including adding Gemma 4 model integration and improving tool-call argument coercion by passing tool schemas through to MLXLMCommon.generate().

Changes:

• Bump mlx-swift-lm (and related pins) and add Gemma 4 model types/parsing support.
• Pass tool schemas into generation to support non-string tool argument coercion (validated via new tests).
• Add --verbose/-v flags to bin/build.sh and bin/test.sh, plus model download list updates.

Reviewed changes

Copilot reviewed 27 out of 31 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
Tests/SHLLMTests/Models/Qwen3-8BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen3-4BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen3-30BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen3-1_7BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen3-0_6BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen3_5-9BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen3_5-4BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen3_5-35B-A3BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen3_5-2BTests.swift	Adds tool-call coercion test for non-string arguments (with thinking disabled).
Tests/SHLLMTests/Models/Qwen3_5-27BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen2_5-7BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Qwen2_5-1_5BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Orchestrator-8BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/NemotronNano-30BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/Ministral-3-14BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/LFM2-8B-A1BTests.swift	Adds tool-call coercion test for non-string arguments.
Tests/SHLLMTests/Models/GPTOSS-20BTests.swift	Adds tool-call coercion test for non-string arguments (Harmony helpers).
Tests/SHLLMTests/Models/Gemma4-E4BTests.swift	New Gemma 4 E4B model tests (text, vision, tools).
Tests/SHLLMTests/Models/Gemma4-E2BTests.swift	New Gemma 4 E2B model tests (text, vision, tools).
Tests/SHLLMTests/Models/Gemma4-12BTests.swift	New Gemma 4 12B model tests (text, vision, tools).
Tests/SHLLMTests/Helpers.swift	Adds mail_read tool schema + response types for tool coercion tests.
Tests/SHLLMTests/Gemma4ChannelParserTests.swift	Adds unit tests for Gemma 4 channel parsing behavior.
Sources/SHLLM/SHLLM.swift	Exports Gemma 4 model classes.
Sources/SHLLM/ResponseParser.swift	Adds Gemma 4 channel parser and model parser bindings.
Sources/SHLLM/LLM.swift	Passes tool schemas into MLXLMCommon.generate() and adds Gemma 4 entrypoints.
Package.swift	Bumps mlx-swift-lm version and notes Gemma 4 resources.
Package.resolved	Updates pinned dependency revisions/versions.
bin/test.sh	Adds --verbose/-v and adjusts xcbeautify usage + Metal toolchain flow.
bin/download.sh	Adds Gemma 4 model IDs to download list.
bin/build.sh	Adds --verbose/-v and adjusts xcbeautify usage.

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