Fail fast when security software blocks a run

On locked-down stations, endpoint-protection software could suspend the Python worker or block the venv interpreter, leaving runs hanging forever with no explanation.

• Added startup watchdogs that detect a stalled Python worker (30s to respond, 300s to finish importing) and fail the phase with clear guidance to allowlist the venv in EDR/antivirus software
• Fixed tofupilot pull to name AppLocker/WDAC/EDR blocking as the cause instead of a bare "Access is denied" error, with one automatic retry for transient scans
• Added a per-run event log at ~/.tofupilot/logs/ referenced from stall diagnostics for faster troubleshooting with IT