🧪 Software Testing Pyramid Economics (2D)

This 2D companion turns the testing pyramid from a static diagram into a running QA-economics simulation: real synthetic bugs, tagged by the layer that would actually catch them in the real-world 65/25/10 unit/integration/E2E defect distribution, flow bottom-to-top through adjustable-size test suites. Coverage saturates with test count on a real diminishing-returns curve, E2E detection is discounted by a flakiness slider, and every caught or escaped bug rolls up into live CI run-time cost and cost-per-bug-caught — the actual economics that make the pyramid shape the right default instead of a thin, top-heavy "ice-cream cone" suite.