classify() under-approximated breakable checks, so scoped PRs skipped the
check their diff would break and regressions reached next (#484 docs-parity,
#482 windows-22 EBUSY). Fail-safe widen: any tests/** change forces
full_matrix (OS-specific test failures); any docs/**, commands/**, agents/**
change marks code_changed and selects docs-parity-live-registry (its runtime
inputs). Updated the docs-only test that asserted the old buggy contract.
Fixes#494
Co-authored-by: CI Rebase Check <ci@gsd-redux>
a7ed001b27