test: measure coverage out-of-process for true 100%

[svaningelgem]

Problem

Project coverage sat at ~76-79% even though the code is well tested. The cause is when coverage starts: pytest-cov begins measuring inside a pytest hook, after pytest has already imported the logprise package and its pytest plugin at startup (via the pytest11 entry point). Their module-level definitions (imports, class/function defs, appriser = Appriser()) therefore never registered as executed.

PR #97 worked around this for pytest_plugin.py with a session-scoped fixture that reloaded the module under coverage. That only patched one file — __init__.py had the same gap — and left a reload hack in the test suite.

Fix

Collect coverage out-of-process with coverage run -m pytest, which starts measurement before pytest imports anything:

• build.yml / release.yml: coverage run -m pytest + coverage xml instead of pytest --cov.
• pyproject.toml: drop the pytest-cov addopts (a plain pytest run stays fast and coverage-free; coverage run reads [tool.coverage.run]). Note: --cov and coverage run together conflict, so it must go.
• conftest.py: remove the module-reload fixture — no longer needed.
• Add tests for the two remaining real branches (notify reporting failure; an already-handled logger).

Result

logprise/__init__.py          206   0   72   0   100%
logprise/pytest_plugin.py      34   0    4   0   100%
TOTAL                         240   0   76   0   100%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6b600e4) to head (2b31c3d).

Additional details and impacted files

@@             Coverage Diff              @@
##           master      #125       +/-   ##
============================================
+ Coverage   72.50%   100.00%   +27.50%     
============================================
  Files           2         2               
  Lines         240       240               
  Branches       38        38               
============================================
+ Hits          174       240       +66     
+ Misses         63         0       -63     
+ Partials        3         0        -3     

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