[Copilot]

What Changed

• Reduced the MariaDB community version list to 12.3, 11.4, 11.8, 10.11, and latest.
• Set W9_VERSION to 12.3 and regenerated the README version support section.

Why Changed

• The previous list contained too many supported versions.

Automated Validation

• .venv/bin/libs app-check --app mariadb — passed.
• .venv/bin/python -m pytest cli/tests/test_readme.py -q — passed (8 tests).
• .venv/bin/libs app-deploy --app mariadb --target local --json — passed; MariaDB 12.3 started.
• .venv/bin/libs app-tests --app mariadb --json — passed (compose-config and container-up).
• .venv/bin/libs app-deploy --app mariadb --target local --down --json — passed; validation container cleaned up.
• git diff --check — passed.

Known Risk

• latest is a moving upstream tag; the generated README recommends pinning a specific version for production.

Owner E2E Checklist

• Confirm the five version options are presented as expected.
• Confirm a new MariaDB deployment can be installed from the app catalog.

Issue: N/A

AI Test Report: Validation evidence is listed above.