Generate portable capability contexts and checked handler registries

test/emit-portable-reader.ts

@@ -0,0 +1,13 @@
+/** Qualification artifact emitted after tests, never a production fixture dependency. */
+import { mkdir, writeFile } from "node:fs/promises";
+import { loadReaderWorkspace } from "./reader-fixture.js";
+import { compileExecutionPlan } from "../src/execution-world/plan.js";
+import { generatePortableTypeScriptBindings } from "../src/bindings/portable.js";
+const plan = compileExecutionPlan(await loadReaderWorkspace());
+await mkdir("dist/portable-reader", { recursive: true });
+for (const target of ["browser", "server"])
+  await writeFile(
+    `dist/portable-reader/${target}.ts`,
+    generatePortableTypeScriptBindings(plan.definition.bindingSchema, "package:reader-runtime@1", { target }),
+  );
+await writeFile("dist/portable-reader/plan.json", JSON.stringify(plan));