Consolidates the 8 computational/interactive-knowledge dives into one
source/derivation/projection model on two axes (replication<->derivation,
live<->snapshot); four computational page shapes; recommendation that
executable content is in scope as a page-model+projection concern, out of
scope as an execution platform (capability-gated, degrade to snapshot;
no INTENT amendment). Flips SHARD-WP-0004 status: done.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
