Detect duplicates in participant_id column

[HippocampusGirl]

Fix #101

And add unit test

[Copilot]

Pull request overview

This PR adds duplicate detection for the participant_id column in phenotype files and includes corresponding unit tests. The changes ensure data integrity by preventing duplicate participant IDs from being loaded into the workflow. Type annotations are also added to improve code clarity.

Changes:

• Added duplicate participant_id validation in load_data_frame() function
• Added type annotations for ages and genders numpy arrays
• Created comprehensive unit tests for the load_data_frame() function

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
wonkyconn/workflow.py	Added duplicate detection check for participant_id and type annotations for age/gender arrays
wonkyconn/tests/test_workflow.py	New test file with comprehensive tests for load_data_frame validation logic

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[codecov]

Codecov Report

❌ Patch coverage is 28.00000% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.65%. Comparing base (68c04a7) to head (919d623).

Files with missing lines	Patch %	Lines
wonkyconn/tests/test_workflow.py	28.57%	15 Missing ⚠️
wonkyconn/workflow.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
- Coverage   54.03%   53.65%   -0.38%     
==========================================
  Files          26       27       +1     
  Lines        1414     1437      +23     
==========================================
+ Hits          764      771       +7     
- Misses        650      666      +16     

Files with missing lines	Coverage Δ
wonkyconn/workflow.py	81.45% <25.00%> (-0.43%)	⬇️
wonkyconn/tests/test_workflow.py	28.57% <28.57%> (ø)

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