Addresses whole-branch review's minor findings:
- Unknown CLI arguments now echo only the flag name, not its value, so a
mistyped flag (e.g. --pasword=secret) can't leak a credential into the
error output.
- README now notes that failed runs retain a screenshot/trace under
test-results/ (gitignored, may contain the username but not the masked
password), and points at the UNVERIFIED post-composer selectors as the
first thing to check during real home-network verification.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Implements run.sh with argument parsing (--username, --password, --subreddit,
--title, --body, optional --headed), environment variable mapping to Task 2's
env contract, Playwright invocation with proper exit-code capture via set +e,
and result file output to stdout.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
