Rebuild core around render graph AST and shared memory

Amp-Thread-ID: https://ampcode.com/threads/T-01a01380-b478-77d0-84a0-102880a5c5ae
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

examples/cookbook/01-canonical-ast.js

@@ -0,0 +1,27 @@
+import {
+  createGraphAst,
+  reference,
+  serializeGraphAst,
+} from "@yawn/render-graph-ast";
+
+const expression = (id, inputs = {}) => ({
+  id,
+  state: "enabled",
+  executor: { key: "and", version: 2 },
+  parameters: {},
+  inputs,
+});
+
+/** Build one DAG whose shared output fans out to two consumers. */
+export function canonicalAstExample() {
+  const ast = createGraphAst({
+    id: "shared_dag",
+    revision: 1,
+    nodes: [
+      expression("source"),
+      expression("left", { inputs: [reference("source", "value")] }),
+      expression("right", { inputs: [reference("source", "value")] }),
+    ],
+  });
+  return { ast, source: serializeGraphAst(ast) };
+}