🛡️ Sentinel: [CRITICAL] Fix command injection in powershell TTS

[omsingh02]

🚨 Severity: CRITICAL
💡 Vulnerability: Direct string interpolation into a powershell command inside FeedbackManager.speak_text could allow command injection via untrusted text containing string termination and PowerShell commands.
🎯 Impact: Could allow execution of arbitrary commands on the user's system via TTS input.
🔧 Fix: Used Python base64 module to encode text before passing it to powershell, then decoding it dynamically in PowerShell to execute SpeechSynthesizer.
✅ Verification: Ensure tests pass and the python program runs appropriately with standard testing (pytest src/ and compileall).

---

PR created automatically by Jules for task 1659581876516126968 started by @omsingh02

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.