Summary

• teach the pytest output parser to count error/errors summary entries separately from failures
• avoid reporting Pytest: No tests collected when pytest exits with collection/runtime errors
• add regression coverage for wrapped and quiet-mode pytest error summaries

Test plan

• git diff --check
• cargo fmt --all && cargo clippy --all-targets && cargo test could not be run locally because cargo is not installed in this workspace
• Manual testing: parser behavior covered by the added unit test cases