Add activated workspace reflection and Studio definition watches

Expose bounded snapshot-bound definition reads and latest-only watches from the serving checked bundle. Add checked reflection dependency ports, generated SDK bindings and selector-scoped invocation authority.

Move Studio factory, contract and query discovery to public reflection inventories. Share an active-definition watch across canvas and standalone routes and invalidate/reload on epoch changes instead of polling GetWorkspace.

Document the API and deferred scope; cover compiler/codegen, SDK injection, transport authorization, activation publication, pagination and reconnect behavior. Keep all work local; no deployment or publication.

dist/bindings.js

@@ -171,6 +171,8 @@ export const bindQxHandler = (spec, handler, messages) => {
                         bindInterfaceView(target, defineQxInterfaceContract(port.interfaceRevisionId, port.operations), messages),
                     ];
                 }
+                case "reflection":
+                    return [name, raw.reflection(port.id)];
                 case "query": {
                     const query = raw.query(port.id);
                     const variablesToWire = (variables) => {