Bash Script Validator

This validates bash and shell scripts using a layered approach: syntax checks with bash -n, ShellCheck static analysis with smart fallbacks when it's missing, and custom rules for security and portability issues. You get subsection-level citations for every fix, which is genuinely useful when you need to justify changes in review or understand the underlying pattern. The rerun policy is strict, requiring validation after each batch of fixes until the script stabilizes or you explicitly document why warnings remain. It handles constrained environments gracefully, falling back to syntax-only checks when ShellCheck isn't available and telling you exactly what coverage you lost. Good for CI gates or cleaning up legacy scripts where you need an audit trail.