An object's `each` source can now be a GRAPH QUERY: `(query is-a TYPE)` resolves to
whatever is-a TYPE *right now* — the list isn't baked into the body, it's the live graph.
The object's `each` IS the query; the render is the run over current data (the unifying
property, now over real data).
compose.sx stays self-contained: the `query` source delegates to a resolver bound in the
render context under "query" — it asks the context for data, never reaching into the graph
itself. The host supplies graph access via host/blog--comp-query (`(query is-a TYPE)` ->
host/blog-instances-of -> full records) injected by host/blog--comp-ctx (auth + resolver);
the post handler renders :body against that context.
Added a `val` leaf — the raw field value with no markup wrapper, for use inside attributes
(href/src). `field` stays span-wrapped for display; `(val :slug)` makes a real link in the
each template. /compose-demo's each is now a live (query is-a compose-item) over two seeded
instances instead of a baked literal list.
Verified end-to-end via a focused harness eval over the full relations+persist+blog stack
(query iterates real instances; clean href via val; empty query -> empty, not an error).
Blog suite 151/153 — the 2 fails ("relate-options load-more sentinel", "related picker
offers all posts") are PRE-EXISTING (clean HEAD is 149/151 with the identical 2 fails, a
relate-picker pagination-boundary issue) and unrelated to composition; my 2 new tests pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
giles
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