🛡️ Sentinel: [HIGH] Fix command injection in iface.uc

[ManupaKDU]

🚨 Severity: HIGH
💡 Vulnerability: Unvalidated configuration variables (num_global_macaddr and data.mbssid) were being interpolated directly into an fs.popen() string, exposing a shell command injection vector.
🎯 Impact: An attacker capable of modifying wifi configurations could execute arbitrary shell commands on the system.
🔧 Fix: Added strict regex validation checking for non-numeric characters (/[^0-9]/) for these variables before they are used in fs.popen(). The execution will now abort with a warning if the validation fails.
✅ Verification: Run sh test_ci.sh to confirm the test suite continues to pass.

Signed-off-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

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PR created automatically by Jules for task 3675711819807471924 started by @manupawickramasinghe

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