Add checked React field bindings and Web Studio factories

Replace opaque props with checked generic presentation contracts and lazy typed
interface references. Generate readonly/writable field APIs and component checks.

Preserve CRDT editing through explicit resolved getter/setter contracts, binding-
fenced delta RPCs, native watches and replica-aware field adapters. Custom setters
retain semantic writes; storage snapshots never grant write authority. Cover
concurrent edits, lost acknowledgements, readonly contracts and authorization.

Add receiver-free static factory dispatch, state-field binding shorthand, and
conformance-based creation. Migrate TODO, editable scaffolds and authoring guides.
Verify language/codegen, SDK, RPC, browser lifecycle, local scaffolds, production
browser bundling and CRDT persistence with temporary PostgreSQL.

dist/bindings.d.ts

@@ -10,7 +10,6 @@ export type MessageBinding<T> = {
     decode(value: Value): T;
 };
 export type QxLiveValue = ReturnType<typeof liveValue>;
-export declare const opaqueReactPropsBinding: MessageBinding<Record<string, unknown>>;
 export type BindingValue<B> = B extends MessageBinding<infer T> ? T : never;
 export type QxHandler<C, O> = (context: C) => O | Promise<O>;
 export type QxDerived<C, O> = {
@@ -71,6 +70,7 @@ export type QxPortSpec = {
     inputType: QxValueType;
 };
 export type QxHandlerSpec = {
+    receiver?: "none";
     inputType: QxValueType;
     outputType: QxValueType;
     eventType?: QxValueType;