[JeroenDeDauw]

Follows-up to #56

The coverage run took its tests from the suites in phpunit.xml.dist, which never listed tests/phpunit/Persistence, so it
ran 405 of the 430 tests the other PHPUnit jobs run. It now passes the test directory to PHPUnit, like those jobs, so it
runs all 430 and a new test directory cannot be left out again. -c still supplies the coverage scope.

Only the coverage run used the Integration suite, so this removes it. Plain vendor/bin/phpunit in the extension
directory now runs the standalone Unit suite, as its comment says, instead of failing on the tests that need MediaWiki.

_{AI-authored — Claude Code, Opus 5.5 (max); one-line ask from @JeroenDeDauw, relayed as a detailed brief, no revisions; diff not yet human-reviewed; coverage run checked locally on a MediaWiki 1.43 CI replica and in the CI log (430 tests), CI green.}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.54%. Comparing base (b11ae40) to head (8772b1d).

Additional details and impacted files

@@                 Coverage Diff                  @@
##             mw-1.47-compat      #57      +/-   ##
====================================================
+ Coverage             83.17%   91.54%   +8.36%     
  Complexity              419      419              
====================================================
  Files                    40       40              
  Lines                  1076     1076              
====================================================
+ Hits                    895      985      +90     
+ Misses                  181       91      -90     

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