Build-an-X workflow that analyzes a repo's test mix (unit / integration / E2E counts + runtimes) and recommends rebalancing toward Cohn's pyramid ratios per the change-set shape - pure-logic-heavy repo wants ~80/15/5; UI-heavy repo wants ~60/25/15. Detects "ice-cream cone" (E2E-heavy) and "hourglass" (integration-thin) anti-patterns. Use quarterly to keep the test mix calibrated to the codebase reality.