feat(registry-envelope-integration): update execute(), call, subscribe, env to return ResponseEnvelope

- OperationRegistry.execute() now returns Promise<ResponseEnvelope<TOutput>>
- Applies shared result pipeline: detect → wrap → normalize → validate
- Uses KindGuard.IsUnknown() to check if Value.Cast should be applied
- PendingRequestMap.call() returns Promise<ResponseEnvelope>
- PendingRequestMap.respond() validates envelope via isResponseEnvelope()
- CallHandler captures handler result, wraps, normalizes, validates, publishes
- CallEventSchema call.responded.output changed to ResponseEnvelopeSchema
- subscribe() yields ResponseEnvelope with isResponseEnvelope() passthrough
- OperationEnv inner functions return Promise<ResponseEnvelope>
- Tests updated for all new return types and behaviors
- 171 tests passing, build and lint clean

src/types.ts

@@ -1,4 +1,5 @@
 import { Type, type Static, type TSchema } from "@alkdev/typebox";
+import type { ResponseEnvelope } from "./response-envelope.js";
 
 export enum OperationType {
   QUERY = "query",
@@ -12,7 +13,7 @@ export interface Identity {
   resources?: Record<string, string[]>
 }
 
-export type OperationEnv = Record<string, Record<string, (input: unknown) => Promise<unknown>>>
+export type OperationEnv = Record<string, Record<string, (input: unknown) => Promise<ResponseEnvelope>>>
 
 export const OperationContextSchema = Type.Object({
   metadata: Type.Optional(Type.Record(Type.String(), Type.Unknown())),