🛡️ Sentinel: [CRITICAL] Fix command injection in terminal API

[LebToki]

🚨 Severity: CRITICAL
💡 Vulnerability: The isAllowedCommand function in public/api/terminal.php used a regular expression to block shell metacharacters but failed to block the carriage return character (\r). On Windows systems, cmd.exe interprets \r as a command separator.
🎯 Impact: An attacker could bypass the command filter and execute arbitrary commands by appending \r followed by a malicious payload to an allowed command.
🔧 Fix: Added \r to the regular expression blocklist (/[;&|$<>\n\r]/) in isAllowedCommand to ensure carriage returns are blocked alongside newlines. ✅ Verification: Ran the security test suite (php tests/SecurityTest.php`) successfully.

Also updated the .jules/sentinel.md journal with details on this vulnerability and learnings about cross-platform shell metacharacter differences.

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PR created automatically by Jules for task 4803291690297334735 started by @LebToki

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