Replace coverage.py (sys.settrace-based) with slipcover (bytecode-based
instrumentation) for significantly faster coverage collection:
- Each behave-parallel worker runs under slipcover, producing per-feature
JSON coverage files with unique UUIDs to avoid write contention.
- After all workers finish, slipcover --merge combines per-worker data
into a single build/coverage.json report.
- XML report generated via slipcover --merge --xml for CI tooling.
- Terminal report with --fail-under=97 threshold enforcement.
- Robust JSON key-fallback logic handles both slipcover and coverage.py
output formats.
- CI workflow (ci.yml, nightly-quality.yml) updated with defensive key
lookup instead of hardcoded coverage.py format.
- Documentation updated to reflect slipcover as the coverage tool.
- CHANGELOG.md updated.
ISSUES CLOSED: #482
freemo
74772280e6