Windows sandbox guidance covers HTTPS failures, pytest hangs and temp folders

The sandbox is a fenced-off area that limits what commands can reach. On Windows, the instructions Claude Code gives the model about the sandbox now cover more cases:

• HTTPS: programs that use Windows' own secure connection system, called Schannel, cannot make HTTPS connections in the sandbox. These include curl.exe, PowerShell's web commands, .NET HttpClient and winget.
• pytest: a recent pytest in a project with no .pytest_cache folder yet can print its results and then never finish. The suggested fix is -p no:cacheprovider.
• Temporary files: the advice about the temporary folder is now written for each shell, using $env:TEMP for PowerShell.

The note about ~\ and %USERPROFILE% was removed from the advice on allowing file reads.