* ci: fail the static job on unformatted files
Runs oxfmt --check over the same tree pnpm format writes (~2s), and makes the
pre-commit hook format markdown and YAML so it covers what CI now checks.
* ci: route docs-only and workflow-only diffs through the formatting check
The format check reads the whole tree, so a diff that skipped the static job
could land drift that fails every later PR. Any changed file oxfmt formats now
selects static analysis (not typecheck or units), like the mobile-only route.
The path detector checks out .oxfmtrc.json for its ignores. The hook no longer
fails a commit whose only matches oxfmt ignores (lockfiles).
