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/08-compile-and-switch.js

@@ -0,0 +1,19 @@
+import { loadGraph } from "@yawn/render-graph-js";
+
+/** Compile a complete AST/JSO and make its prepared loadout active. */
+export async function compileAndSwitch(core, graph) {
+  const compiled = await loadGraph(core, graph);
+  try {
+    await core.switchCompiledGraph(compiled.compiledId);
+    return compiled;
+  } catch (error) {
+    await core.dropCompiledGraph(compiled.compiledId).catch(() => {});
+    throw error;
+  }
+}
+
+/** Return to clear-only mode before releasing an active compiled loadout. */
+export async function dropActiveGraph(core, compiled) {
+  await core.switchToImmediate();
+  await core.dropCompiledGraph(compiled.compiledId);
+}