🧪 Add exception test for TryWriteBlackBoxSnapshotCold in AmbientBiotaDirector

[marko1olo]

🎯 What: The TryWriteBlackBoxSnapshotCold method in AmbientBiotaDirector was missing an exception handler for InvalidOperationException that could be thrown by NativeFaultDumpWriter.CreateTransientPayload. I added the try-catch block and wrote a robust Edit-mode test TryWriteBlackBoxSnapshotCold_ReturnsFalseOnInvalidOperationExceptionFromWriter to verify it handles the exception by returning false safely.
📊 Coverage: The edge case where the system fails to allocate a transient payload from the unmanaged NativeMemoryTrackingBridge is now tested.
✨ Result: Test coverage for this edge case is implemented, improving robustness for the AI ambient director subsystem.

---

PR created automatically by Jules for task 15967694019711812378 started by @marko1olo

[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.