fix for windows

[xzrderek]

Note

Improves cross-platform robustness of local code execution (esp. Windows) and tightens runtime guards.

• Python exec: conditional resource import and runtime checks; Unix uses SIGALRM and RLIMIT_CPU if available, Windows/non-Unix falls back to subprocess.communicate(timeout); safer reliability guard generated into temp script; guarded os.* disables via hasattr; consistent temp-file cleanup
• JavaScript exec: optional SIGALRM as backup; primary timeout via communicate(timeout); clearer timeout handling and alarm cleanup
• reliability_guard: resource limits applied only if resource exists; Unix-only os operations disabled conditionally
• Minor: add pyright ignore on content-part access

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