reactive-spread (module-loaded via K.load) doesn't apply CSSX classes to DOM elements. Returns null instead of "sx-text-center". This is the root cause of hydration stripping all styling — every rendering function is define-bound from module load. 12 pass, 1 fail — the reactive-spread test is the blocker. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>