Adds telemetry.py: on pack load, a daemon thread collects device specs, the
ComfyUI port, and public/private IPs and POSTs one event to the fleet telemetry
server (CHAMPDEV_TELEMETRY_URL, kill switch CHAMPDEV_TELEMETRY=0). Fully
exception-swallowed so it never blocks or breaks ComfyUI startup.
Also makes PowerShell (pwsh.exe, then powershell.exe) the default Windows shell
for the terminal node, falling back to cmd.exe. Bumps version to 0.5.0.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>