CI: Add --prefer-binary, --no-cache-dir, --force-reinstall flags and single test reproduction step

[Copilot]

Description

Improves CI reliability by forcing binary wheels for numpy/scipy with cache bypass and adding early environment validation via single test execution.

Related Issue

Fixes #2

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Test addition/improvement

Changes Made

• Added --prefer-binary --no-cache-dir to all pip install commands across test, lint, and examples jobs
• Added --force-reinstall for numpy/scipy installation to prevent ABI mismatches between cached and newly installed wheels
• Added "Run single test for reproduction" step before full test suite to validate environment setup early

Testing

• Existing tests pass
• Added new tests for new functionality
• Manually tested changes
• Tested on multiple Python versions (if applicable)

Test Commands Run

# Verified new installation flags work correctly
python -m pip install --prefer-binary --no-cache-dir --force-reinstall --only-binary=:all: numpy scipy

# Verified single test reproduction step
python -X faulthandler -m pytest tests/test_audio_processor.py::TestEqualizerBand::test_initialization -v

# Verified full test suite
python -m pytest tests/ -v --maxfail=1

Test Results

54 tests passed successfully
No security vulnerabilities detected (CodeQL)
YAML syntax validated

Screenshots (if applicable)

N/A

Checklist

• My code follows the style guidelines of this project (see CONTRIBUTING.md)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Additional Notes

The changes only modify .github/workflows/ci.yml. No production code or tests were altered.

The single test reproduction step provides fast feedback (< 2s) before running the full suite, making it easier to isolate environment setup issues from actual test failures.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>bug fix #2</issue_title>
<issue_description>•Add a CI step before installing requirements to run: pip install --upgrade pip setuptools wheel

•Reinstall or pin numpy/scipy to compatible binary wheel versions (or force reinstall) to avoid ABI mismatches.

•Optionally add --prefer-binary and --no-cache-dir when installing to prefer prebuilt wheels.
If you want isolation, add a step to run one failing test to reproduce and then run full test suite.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes bug fix #2 #16

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