🧹 Refactor unsafe echo usage for variable content

[sstklen]

🎯 What: Replaced unsafe echo "$CMD" with printf '%s\n' "$CMD" in hooks/pre-bash-guard.sh and hooks/post-deploy-health.sh.

💡 Why: echo can inadvertently parse options (like -n, -e) or escape sequences within user input, leading to unexpected behavior or potential bugs. printf '%s\n' is a robust standard that safely prints exactly what is provided, followed by a newline, improving the script's maintainability and security.

✅ Verification: Ran syntax validation using bash -n on the modified files, manually verified their original behaviors using appropriate arguments (e.g., rm -rf /, deploy production), and tested edge cases containing potential echo flags (-n, -e). No regressions observed.

✨ Result: Enhanced the resilience and reliability of the hook scripts against unpredictable user input variables without changing any existing functionality.

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PR created automatically by Jules for task 8015866836411747597 started by @sstklen

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