Makefile Validator

If you need to validate Makefiles before CI or catch subtle issues like missing .PHONY declarations, tab-versus-space errors, or credential leaks, this runs a layered check through GNU make syntax validation, mbake linting, and custom security audits. It returns explicit exit codes (0 for clean, 1 for warnings, 2 for errors) and only loads the relevant docs when it finds something. The deterministic flow means you run the validator script, interpret the findings, apply fixes, and rerun until clean. Fallback paths handle missing dependencies gracefully. It's built for deterministic, local-first validation rather than quick linting, so expect a thorough pass that catches both syntax problems and best-practice violations in one go.