Fix publish workflow inputs and add branch verification

[masquare]

Fix publish workflow inputs and add branch verification

♻️ Current situation & Problem

Fixes issues with the PyPI publish workflow (publish.yml):

1. Incorrect YAML structure for workflow dispatch inputs (nested under target instead of directly under inputs)
2. Inconsistent casing for TestPyPI (was TestPyPi)
3. Smoke tests referencing old tests/ directory (should be test/)
4. Missing safety mechanism to prevent accidental publication to PyPI from non-main branches

Related to: Refactor repo structure and move package management to uv (#38)

⚙️ Release Notes

Improvements:

• Fixed GitHub Actions workflow YAML syntax for publish workflow dispatch inputs
• Added branch verification step to prevent publishing to PyPI from non-main branches
• Updated smoke test paths to match current repository structure
• Fixed casing inconsistency: TestPyPi → TestPyPI

Breaking Changes: None

📚 Documentation

The changes are self-documented through:

• Clear error message when attempting to publish to PyPI from a non-main branch
• In-line comments explaining the branch verification check
• Consistent naming conventions across the workflow

✅ Testing

The workflow has been tested with:

• Manual workflow dispatch to verify input structure is correctly parsed
• Branch verification logic confirms that only the main branch can publish to PyPI
• Smoke tests now correctly reference the test/ directory
• All changes maintain backward compatibility with existing PyPI and TestPyPI publication flows

Testing performed:

• ✅ Verified workflow YAML syntax is valid
• ✅ Tested branch verification logic blocks non-main branch publications
• ✅ Confirmed smoke test paths exist and are executable

Code of Conduct & Contributing Guidelines

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• I agree to follow the Code of Conduct and Contributing Guidelines.

[Copilot]

Pull request overview

This PR fixes critical issues in the PyPI publish workflow to ensure correct YAML structure, consistent naming conventions, and safety mechanisms for production deployments.

Key changes:

• Fixed workflow dispatch inputs structure by removing incorrect nesting under target
• Added branch verification to prevent accidental PyPI publication from non-main branches
• Corrected TestPyPI naming consistency and smoke test paths

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