Simplify workspace authoring and isolate managed component styles

Use imperative scaffolds without a registry/refresh lifecycle; preserve authored runtime wiring and generate checked descriptors. Consolidate binding options, embed checked TSX/CSS source, queue mutable convergence while allowing parallel immutable checks, and preload real CLI observations. Add Shadow DOM boundaries with scoped overlays and composed-event handling. Update template/toolchain pins and document VM-free authoring, browser, and stateful acceptance; no deployment or default-template selection.

src/capability-language/implementation-edit.ts

@@ -0,0 +1,29 @@
+import {parse} from "@babel/parser";
+type Node = {type: string; start: number; end: number; [key: string]: unknown};
+const node = (value: unknown): value is Node => !!value && typeof value === "object" && typeof (value as Node).type === "string";
+
+/** One requested insertion into ordinary authored TypeScript, not regeneration.
+ * Ambiguous/custom wiring is left alone with an actionable error. */
+export function addImplementation(text: string, factory: "createRuntime" | "serveMigration", key: string, importPath: string, migrationOnly = false): string {
+  const ast = parse(text, {sourceType: "module", plugins: ["typescript"]});
+  const objects: Node[] = [];
+  const names = new Set<string>();
+  const visit = (value: unknown) => {
+    if (Array.isArray(value)) { value.forEach(visit); return; }
+    if (!node(value)) return;
+    if (value.type === "Identifier") names.add(String(value.name));
+    if (value.type === "CallExpression" && node(value.callee) && value.callee.type === "Identifier" && value.callee.name === factory &&
+        Array.isArray(value.arguments) && value.arguments.length === 1 && node(value.arguments[0]) && value.arguments[0].type === "ObjectExpression") objects.push(value.arguments[0]);
+    Object.values(value).forEach(visit);
+  };
+  visit(ast);
+  if (objects.length !== 1) throw new Error(`Cannot safely add implementation: expected one ${factory}({...}) literal. Wire the handler in your authored server code instead.`);
+  const object = objects[0];
+  if ((object.properties as Node[]).some(p => node(p.key) && !p.computed && (p.key.name === key || p.key.value === key))) throw new Error(`Implementation already exists for ${key}`);
+  let alias = "qxImplementation";
+  for (let index = 1; names.has(alias); index++) alias = `qxImplementation${index}`;
+  const value = migrationOnly ? 'async () => { throw new Error("Migration-only export"); }' : alias;
+  const insertion = object.start + 1;
+  const edited = text.slice(0, insertion) + `\n  ${JSON.stringify(key)}: ${value},\n` + text.slice(insertion);
+  return (migrationOnly ? "" : `import {handler as ${alias}} from ${JSON.stringify(importPath)};\n`) + edited;
+}