Added shellcheck to catch bash anti-patterns across 115 scripts:
- Created .shellcheckrc configuration
- Added GitHub Actions workflow (.github/workflows/lint.yml)
- Documented shellcheck usage in README
Currently found 3,598 warnings (expected for unlinted codebase).
Using || true temporarily to not block PRs - warnings will be fixed
incrementally in follow-up tasks.
Common issues: SC2250 (missing braces), SC2162 (read without -r),
SC2312 (command substitution masking), SC1091 (sourcing pattern).
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
