Replace mlx-swift-examples with mlx-swift-lm

[atdrendel]

• Update to swift-tools-version 5.12
• Require iOS 17, Mac Catalyst 17, and macOS 14

[Copilot]

Pull request overview

Updates SHLLM’s MLX dependency from mlx-swift-examples to mlx-swift-lm, aligning tool-call handling and related test scaffolding with the newer upstream APIs.

Changes:

• Swap SwiftPM dependency from mlx-swift-examples to mlx-swift-lm (and update resolved pins).
• Migrate LFM2 tool-call handling away from a custom response parser to configuration-based formatting (toolCallFormat = .lfm2) and remove the old parser/Python helper + their unit tests.
• Update tokenizer/tool test utilities to match newer Tokenizers API surface (e.g., ToolSpec, any Sendable contexts).

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
Tests/SHLLMTests/TruncatingUserInputProcessorTests.swift	Updates the test tokenizer stub to satisfy newer Tokenizer requirements (e.g., callAsFunction, hasChatTemplate, any Sendable additionalContext).
Tests/SHLLMTests/Tool+SHLLMTests.swift	Updates test tool schemas to return ToolSpec and adapts nested dictionaries for any Sendable.
Tests/SHLLMTests/PythonTests.swift	Removes Python parser unit tests (file deleted).
Tests/SHLLMTests/Models/LFM2-8B-A1BTests.swift	Switches LFM2 tests to configure .lfm2 tool-call format rather than providing a custom response parser.
Tests/SHLLMTests/LFM2ParserTests.swift	Removes LFM2 parser unit tests (file deleted).
Sources/SHLLM/SHLLM.swift	Switches cache management from MLX.GPU to Memory.
Sources/SHLLM/ResponseParser.swift	Removes the LFM2-specific response parser implementation.
Sources/SHLLM/LLM.swift	Updates memory logging to use Memory.activeMemory and configures LFM2 via toolCallFormat.
Package.swift	Bumps Swift tools version / minimum iOS+macCatalyst targets and swaps dependency to mlx-swift-lm.
Package.resolved	Updates dependency pins and SwiftPM resolved-file format/version.

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