The post body is now editable as a composition. Model ops over the :body ref-seq (and the
ordered `contains` edges): host/blog-block-add! (create a card object is-a a card-type +
fields, contains edge, append a ref), -remove! (drop ref + edge), -move! (swap adjacent).
host/blog--block-editor renders a row per block — type + a content preview + ↑/↓/remove
controls + a "fields" link — plus an add-block form, injected into the edit page. Routes
POST /:slug/blocks/{add, :cslug/remove, :cslug/move} (guarded; SX-htmx sx-post + outerHTML
swap of #block-editor, redirect fallback for no-JS).
Cards-as-objects pays off: per-block FIELD editing is free — a card IS an object, so its
fields are edited via its own /<cslug>/edit page; the block editor only owns structure.
Guard fix: a card type is a SUBTYPE-OF card (not is-a), so the add validates ctype against
the down-closure of "card", not host/blog-is-a?. Verified via the warm server (162/164; the
2 fails are the pre-existing relate-picker pair). Deferred: Playwright live-swap check;
alt/each block insertion (the core editor handles the seq of refs).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
giles
b78491a5a1