Program-as-page rendered live at view time (no cached output). Adds
materialization-timing (ahead-of-time vs view-time) + continuity
(one-shot vs continuous) facets to the projection model; execute-in-viewer
= capability+trust. Enrichment-only (UC-54/55). Marks T4 done.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
