With homeowners’ equity soaring to near-record levels, financial technology entrepreneurs — backed by deep-pocket venture capital — are dreaming up sophisticated ways to help consumers access that equity without traditional interest payments. The core concept in most of these plans: We’ll give you cash, say $30,000 to $200,000 dollars or more, if you’ll let us share in some of the growth in value of your home when you sell, refinance or buy us out. And … [more]