Add integration tests for MLX nodes on GitHub Actions with Apple Silicon runners

[Copilot]

Adds integration test suite for nodetool-mlx that runs on GitHub Actions using macOS 14 (Apple Silicon) runners.

Test Suite

• Location: tests/integration/test_mlx_import.py
• Scope: Import validation and dependency availability checks
  • MLX framework availability
  • All node classes (Whisper, TTS, Flux1Dev, Flux1Schnell, TextGeneration)
  • MLX dependencies (mlx-whisper, mflux, mlx-audio)
• Design: Lightweight checks that don't require model downloads or GPU operations

GitHub Actions Workflow

.github/workflows/integration-tests.yml runs on:

• Push/PR to main or develop branches
• Manual workflow dispatch

Configuration:

• Runner: macos-14 (Apple Silicon M1)
• Python: 3.11
• Timeout: 30 minutes
• Permissions: contents: read (minimal)

Outputs:

• JUnit XML reports
• GitHub Actions step summaries
• Test artifacts (30-day retention)

Documentation

• tests/README.md: Local and CI test execution
• Updated main README.md with testing section
• pytest.ini: Test markers and configuration

Original prompt

add integration tests running on Github action on apple machines

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