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/env.ts

@@ -1,12 +1,13 @@
 import { OperationType } from "./types.js";
 import type { OperationContext, OperationEnv, Identity } from "./types.js";
 import type { OperationRegistry } from "./registry.js";
+import type { ResponseEnvelope } from "./response-envelope.js";
 import { getLogger } from "@logtape/logtape";
 
 const logger = getLogger("operations:env");
 
 export interface CallMap {
-  call(operationId: string, input: unknown, options?: { parentRequestId?: string; deadline?: number; identity?: Identity }): Promise<unknown>;
+  call(operationId: string, input: unknown, options?: { parentRequestId?: string; deadline?: number; identity?: Identity }): Promise<ResponseEnvelope>;
 }
 
 export interface EnvOptions {