oscal-validate 0.2.0

Composite GitHub Action for OSCAL structural validation.

Runs the CLI over a file, a directory, or a glob and annotates each finding on
the file it came from. Inputs: path, resolve, fail-on. Counts published as step
outputs, including unverifiable-count, which gates at no fail-on setting
because an unverifiable reference is never a pass and never a fail.

Two exit codes refuse to pass silently: a path matching no file is exit 2, and
an unreadable document is exit 2 even when every other document is clean.

Supersedes v0.1.0, which was tagged without review and does not contain the
action it was the latest release for.

Verified at this tag: 137 tests, 92.46% coverage, ruff, mypy strict, pip-audit.