Upgradeable-Dice spec lands + engine core + economy sim (D1-D3)
What changed
the spec-33 dice-as-equipment rework got its pre-code review (die gear replaces face-swapping, STAKE retired, momentum null-reset, surge-until-spent), then shipped flagged: four fixed dice with a die-gear interface, stance-from-cards, honest Press Fate, and a Monte-Carlo sim harness that derived the D3 economy gates (E[usable]≈1.83, whiff≈8.3%, ◆ income 1.21 — all in band).
Why it changed
the shipped Phase 31 momentum wheel and 2026-07-09 dice law were both slated for supersession by spec 33; D1 settled every open spec question before D2 wrote a line of engine code, so the whole D-series builds on ratified ground instead of guesses.