Resolve a named read's offset when the graph compiles

The fold already holds the name and the read input's finished layout, so
the offset falls out there rather than at construction: `RecordLayout`
carries the resolved numbers and `set_layout` copies them into the read
slots. Constructors are untouched, and census-marker reads keep their
current installation.

A read meets the value type the name was written at, so a disagreement
between a read here and a write upstream is the same graph error as two
writes disagreeing; the one-name-one-type check now spans reads and
writes together. An absent attribute stays absent and the read serves
the forced default rather than reporting it.

`read_attribute` is the catalog's get half, typed and never `Option` at
the kernel boundary, with the name declared exactly as the write side
declares it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

node-graph/nodes/graphic/src/record.rs

@@ -286,6 +286,7 @@ mod tests {
 		// pass records as lane-invariant.
 		let resolved = record::RecordLayout {
 			named_writes: Vec::new(),
+			named_reads: Vec::new(),
 			lane_invariant: u32::MAX,
 			..meta.resolve(inputs)
 		};
@@ -296,6 +297,7 @@ mod tests {
 	fn install_flip<N: Node<ContextImpl<'static>>>(mut node: N, layout: &Layout) -> N {
 		let bundle = record::RecordLayout {
 			named_writes: Vec::new(),
+			named_reads: Vec::new(),
 			frame_bytes: layout.frame_bytes(),
 			plan: Vec::new(),
 			layout: layout.clone(),
@@ -424,6 +426,8 @@ mod tests {
 		record::LayoutMeta {
 			named_writes: Vec::new(),
 			folded_names: Vec::new(),
+			named_reads: Vec::new(),
+			folded_read_names: Vec::new(),
 			sources: vec![source],
 			reads: vec![],
 			element: record::ElementSpec::Carried,