🛡️ Sentinel: [CRITICAL] Fix command injection in text-to-speech

[omsingh02]

🚨 Severity: CRITICAL
💡 Vulnerability: The speak_text function in src/services/feedback.py used direct string interpolation to construct a PowerShell script passed to subprocess.Popen. This allowed an attacker to break out of the string context and execute arbitrary PowerShell commands via crafted input (e.g., Hello "; Write-Host "Hacked).
🎯 Impact: Remote Code Execution (RCE) / OS Command Injection, allowing arbitrary command execution on Windows platforms.
🔧 Fix: Encoded the text payload using Base64 (utf-16le encoding to match PowerShell's [System.Text.Encoding]::Unicode) in Python, and decoded it within the PowerShell script using [Convert]::FromBase64String. This safely sanitizes the payload without needing complex character escaping.
✅ Verification: Ran syntax checks (python -m compileall src/) and verified code modification to ensure text is correctly encoded and decoded.

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PR created automatically by Jules for task 2216787331064323889 started by @omsingh02

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