Fix first load flash and black screen: no pow() of a negative base in the intro sweep shader (NaN on real GPUs, spread by bloom), guarded normal and rim terms, service worker serves exact ?v= matches only (older copies are the offline fallback), cache bust nan1
Chase
b24a488
Public API at window.unroll (schema, help, coverage test; ui and bench groups), embed mode with postMessage bridge and oEmbed, version 0.9.4 in About and API, ink_9um (9 µm) label and credit, Ink Bench hardening from the audit, hashchange without reload, capped test hooks
Sandbox debris: triangles bound to removed nodes are hidden instead of hanging frozen; tiny loose pieces become crumbs, small pieces held by a glued node are freed, a sheet only sleeps when no free piece is off the floor; crumbs and flakes settle and fade like the main view; cache-busting ?v= on the JS modules; sandboxStats/sandboxSim test hooks
