4-phase design: server endpoint for on-demand component defs, SX-specced client prefetch logic (hover/viewport triggers), boundary declarations, and bootstrap integration. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
4-phase design: server endpoint for on-demand component defs, SX-specced client prefetch logic (hover/viewport triggers), boundary declarations, and bootstrap integration. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>