Merging keeps the earliest start time

[eda-s-claude-bot]

Bug Fixes

• pyEDAA.Reports.Unittesting:

  • Merging lost the start time. MergedTestsuiteSummary.Merge() never touched _startTime, so every merged
    report came out without one - the same shape as the hostname before
    #162. A merged entity now starts when the earliest of
    its parts started, and a part without a start time contributes nothing rather than erasing what is known. The
    rule lives on the Merged mixin, so MergedTestsuite and MergedTestsuiteSummary share it.

    Six conversions were affected - Ant-JUnit4, CTest-JUnit and GoogleTest-JUnit into CTest-JUnit and
    GoogleTest-JUnit, whose schemas require timestamp:

    $ pyedaa-reports unittest --merge=Ant-JUnit:TEST-my.AllTests.xml --output=CTest-JUnit:out.xml
    [ERROR]     The CTest + JUnit format requires a timestamp on <testsuite>, but the report has none.
    [FATAL]     Too many errors in previous steps.     # exit code 255
    

    It now exits 0 and writes a schema-valid report.

Unit Tests

• Four testcases in tests/unit/Unittesting/Hostname.py: one report, the earliest of two, a report without a
  start time next to one with, and neither having one.
• tests/unit: 157 → 161 passed.

Known Issues

• This is the merge losing a value it was given. The related question - deriving a summary's start time from its
  children when it never had one, which is what pyTest-JUnit → CTest-JUnit would need - is still open and
  still yours: pytest writes timestamp on <testsuite> but not on <testsuites>.

---

Related Issues and Pull-Requests

• Found by driving the dialect matrix through the command line rather than the data model. Without this, six cells
  of that matrix fail at application level while passing at unit level.

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 31.68%. Comparing base (469beb1) to head (d249f03).

Files with missing lines	Patch %	Lines
pyEDAA/Reports/Unittesting/__init__.py	12.50%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #167      +/-   ##
==========================================
- Coverage   31.74%   31.68%   -0.07%     
==========================================
  Files           9        9              
  Lines        2498     2506       +8     
  Branches      396      398       +2     
==========================================
+ Hits          793      794       +1     
- Misses       1705     1712       +7     

Flag	Coverage Δ
unittests	31.68% <12.50%> (-0.07%)	⬇️

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