- Harden SpawnSendTelemetry against relative executable paths
- Use io.Copy for telemetry subprocess stdin write
- Clean up GH_TELEMETRY/DO_NOT_TRACK help text
- Fall back to built-in defaults (NoOp telemetry) on config load failure
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>