Update Psalm 7 tooling and cleanup tests

[koriym]

Summary

• Update the tools bin to track Psalm 7 via ^7.0@beta and refresh the tools lockfile.
• Align Psalm analysis with the package PHP requirement by targeting PHP 8.2.
• Clean up test bootstrap file removal and HTTP test server lifecycle handling.
• Ignore generated coverage-pcov.xml and the separate gh-pages/ checkout in the main repository.
• Add strict Composer metadata to bin composer manifests.

Validation

• composer cs-fix
• composer tests
• composer validate --strict --no-check-lock (local ignored root composer.lock is stale)
• composer bin tools validate --strict
• composer bin require-checker validate --strict
• composer bin tools audit --no-interaction
• composer bin require-checker audit --no-interaction
• composer bin tools outdated --direct --locked
• composer bin require-checker outdated --direct --locked
• git diff --check
• git merge-tree --write-tree upstream/1.x HEAD

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6547177) to head (491901d).

Additional details and impacted files

@@             Coverage Diff             @@
##                 1.x      #371   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       687       687           
===========================================
  Files             96        96           
  Lines           1720      1720           
===========================================
  Hits            1720      1720           

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