Add get_run method to SampleRegistry

[Ulthran]

Summary

• expose a get_run method on SampleRegistry to fetch run records
• cover get_run behavior with new tests

Testing

• PYTHONPATH=app/sample_registry/src pytest -q

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https://chatgpt.com/codex/tasks/task_e_68c3611b2d6883238d2c5743f6a10e36

[codecov]

Codecov Report

❌ Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.12%. Comparing base (a41657a) to head (67b35e3).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...p/sample_registry/src/sample_registry/registrar.py	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   85.96%   86.12%   +0.15%     
==========================================
  Files          11       11              
  Lines         869      879      +10     
==========================================
+ Hits          747      757      +10     
  Misses        122      122              

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[Copilot]

Pull Request Overview

This PR adds a get_run method to the SampleRegistry class to fetch run records by accession number. The new method provides a more lenient alternative to the existing check_run_accession method by returning None instead of raising an exception when a run doesn't exist.

• Adds get_run method that returns a Run object or None
• Includes comprehensive test coverage for both successful retrieval and non-existent runs

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
app/sample_registry/src/sample_registry/registrar.py	Adds the new get_run method with proper documentation
app/sample_registry/test/test_registrar.py	Adds tests for both successful and unsuccessful run retrieval scenarios

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