Handle HTTP errors for sandbox operations (run, read, write).
Maps API error types to specific exceptions:
- WriteError -> SandboxOperationError (operation="write")
- ReadError -> SandboxOperationError (operation="read")
- CommandError -> SandboxOperationError (operation="command")
- ConnectionError (502) -> SandboxConnectionError
- FileNotFound / 404 -> ResourceNotFoundError (resource_type="file")
- NotReady (400) -> SandboxNotReadyError
- 403 -> SandboxOperationError (permission denied)
