[Tcode-Motion]

🎯 What: Hardened PowerShell execution in standard notification library (stdlib/src/notification.rs) by adding -NoProfile and -NonInteractive flags and refactoring argument construction into a cross-platform testable helper function.

⚠️ Risk: Executing PowerShell without -NoProfile and -NonInteractive flags allows execution of untrusted user profile scripts (Microsoft.PowerShell_profile.ps1) when launching powershell.exe, potentially allowing privilege escalation or arbitrary code execution via profile hijacking.

🛡️ Solution: Updated stdlib/src/notification.rs to include -NoProfile and -NonInteractive flags when spawning PowerShell, preventing user profile script execution and interactive stalls. Refactored argument construction into build_powershell_notification_args and added unit tests to verify security flags and safe encoding of arbitrary input strings.

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PR created automatically by Jules for task 18421920614302179730 started by @Tcode-Motion

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