gstack-pregate never treated a .bats file as a test, so in a repository whose
tests are bats files the lanes check failed every run with PREGATE_NO_LANE: a
.gstack/pregate.json dependency pointing at tests/foo.bats selected nothing, a
selection manifest printing .bats paths yielded 0 files, and a bats run that
executed no tests could not trip the zero-run rule.
Recognise .bats in the test-file pattern and in the manifest-output parser, and
read the bats TAP plan and pretty summary (as a last resort, after every
existing runner's summary) so a run that reports zero tests is a failure.
Fixes#3161.
Cherry-picked from #3177 (d355c116b). Conflicts resolved as in the author's own
merges (b09476beb, 444f4e768): lane-selection.ts keeps main's isTestFile-based
manifest parser, and lanes.ts carries the bats summary on main's supervised runner.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>
