remote-pianobar

Use before git push in remote-pianobar when src/ or webui/src/ production code changed. Verifies ≥90% Codecov patch coverage on the diff, matching codecov.yml and AGENTS.md.

Use before git push in remote-pianobar when Makefile, test sources, or CI workflows changed. Ensures a clean test build matches GitHub Actions (test-coverage), catching compile and headless-integration failures that incremental make test-all misses.