This PR removes SonarCloud/SonarQube integration from the repository and CI surface area. It strips the remaining Sonar-specific workflow, tooling, configuration, and metadata artifacts so no Sonar dependency remains.

• CI workflow

  • Removed SONAR_TOKEN from .github/workflows/test-and-release.yml.
  • Eliminates Sonar-specific secret plumbing from the test job environment.

• Local automation (nox)

  • Removed the Sonar submission block from noxfile.py:test():
    • token gating via SONAR_TOKEN
    • Sonar scanner unzip/bootstrap from .test_deps
    • sonar-scanner execution
    • Sonar skip/status logging

• Repository metadata/docs

  • Removed Sonar badges from README.md (Quality Gate, Reliability).
  • Deleted sonar-project.properties.
  • Removed Sonar scanner documentation from .test_deps/README.md.
  • Removed Sonar-specific ignore rules from .test_deps/.gitignore.
  • Deleted bundled scanner archive: .test_deps/sonar-scanner-cli-5.0.1.3006-linux.zip.
  • Removed leftover Sonar dictionary token from .idea/dictionaries/pavel.xml.

Example of the workflow/tooling cleanup:

# .github/workflows/test-and-release.yml
env:
  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  FORCE_COLOR: 1

# noxfile.py (test session)
# SonarCloud submission block removed entirely.

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