refactor(ts): complete legacy host removal — drop fastify/commander/zod, delete MCP SDK server, remove ManagedRuntime facades

Finishes the remaining EFFECT_NATIVE_REWRITE_PLAN stages in one verified slice:
- fastify, @fastify/websocket, commander, zod removed from all package manifests
- legacy @modelcontextprotocol/sdk stdio server deleted; effect/unstable/ai McpServer is canonical
- no ManagedRuntime or Effect.runPromise program facades remain in production source
- gateway server/rpc-contract and client rpc/socket moved onto Effect v4 native http/rpc/socket layers

Gates (force-run, no cache): check:tsgo, build, test (96 tests / 11 tasks) all green.
Native-class inventory: zero blocking production classes.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ts/packages/flow/package.json

@@ -12,21 +12,13 @@
   },
   "dependencies": {
     "@effect/ai-anthropic": "4.0.0-beta.78",
-    "@effect/ai-openai": "4.0.0-beta.78",
-    "@effect/ai-openrouter": "4.0.0-beta.78",
-    "@effect/atom-react": "4.0.0-beta.78",
-    "@effect/openapi-generator": "4.0.0-beta.78",
-    "@effect/opentelemetry": "4.0.0-beta.78",
-    "@effect/platform-browser": "4.0.0-beta.78",
     "@effect/platform-bun": "4.0.0-beta.78",
     "@effect/platform-node": "4.0.0-beta.78",
-    "@effect/platform-node-shared": "4.0.0-beta.78",
-    "@effect/tsgo": "0.14.0",
-    "@effect/vitest": "4.0.0-beta.78",
     "@mistralai/mistralai": "^1.0.0",
     "@modelcontextprotocol/sdk": "^1.12.0",
     "@qdrant/js-client-rest": "^1.13.0",
     "@trustgraph/base": "workspace:*",
+    "@trustgraph/client": "workspace:*",
     "effect": "4.0.0-beta.78",
     "falkordb": "^5.0.0",
     "ollama": "^0.6.3",

ts/packages/flow/src/gateway/dispatch/manager.ts

@@ -12,6 +12,7 @@ import { Clock, Effect, Exit, HashMap, HashSet, Option, Random, Scope, Synchroni
 import {
   loadMessagingRuntimeConfig,
   makeNatsBackend,
+  makeNatsBackendScoped,
   makePubSubService,
   makeRequestResponseFactoryService,
   messagingDeliveryError,
@@ -401,3 +402,17 @@ export function makeDispatcherManager(config: GatewayConfig): DispatcherManager
     publishToTopic,
   };
 }
+
+export const makeDispatcherManagerScoped = Effect.fn("makeDispatcherManagerScoped")(function* (
+  config: GatewayConfig,
+) {
+  if (config.pubsub !== undefined) {
+    return makeDispatcherManager(config);
+  }
+
+  const pubsub = yield* makeNatsBackendScoped(config.natsUrl ?? "nats://localhost:4222");
+  return makeDispatcherManager({
+    ...config,
+    pubsub,
+  });
+});

ts/packages/flow/src/gateway/rpc-contract.ts

@@ -1,34 +1 @@
-import { Schema as S } from "effect";
-import * as Rpc from "effect/unstable/rpc/Rpc";
-import * as RpcGroup from "effect/unstable/rpc/RpcGroup";
-
-export class DispatchPayload extends S.Class<DispatchPayload>("DispatchPayload")({
-  scope: S.Literals(["global", "flow"]),
-  service: S.String,
-  flow: S.optionalKey(S.String),
-  request: S.Record(S.String, S.Unknown),
-}) {}
-
-export class DispatchStreamChunk extends S.Class<DispatchStreamChunk>("DispatchStreamChunk")({
-  response: S.Unknown,
-  complete: S.Boolean,
-}) {}
-
-export class DispatchError extends S.TaggedErrorClass<DispatchError>()("DispatchError", {
-  message: S.String,
-}) {}
-
-export class Dispatch extends Rpc.make("Dispatch", {
-  payload: DispatchPayload,
-  success: S.Unknown,
-  error: DispatchError,
-}) {}
-
-export class DispatchStream extends Rpc.make("DispatchStream", {
-  payload: DispatchPayload,
-  success: DispatchStreamChunk,
-  error: DispatchError,
-  stream: true,
-}) {}
-
-export const TrustGraphRpcs = RpcGroup.make(Dispatch, DispatchStream);
+export * from "@trustgraph/client/rpc/contract";

ts/packages/flow/src/gateway/server.ts

@@ -10,6 +10,7 @@ import { NodeHttpServer, NodeRuntime } from "@effect/platform-node";
 import { Clock, Config, Effect, Exit, Layer, Random, Scope } from "effect";
 import * as O from "effect/Option";
 import { HttpRouter, HttpServerRequest, HttpServerResponse } from "effect/unstable/http";
+import { HttpApiBuilder } from "effect/unstable/httpapi";
 import * as RpcSerialization from "effect/unstable/rpc/RpcSerialization";
 import {
   formatPrometheusMetrics,
@@ -19,7 +20,8 @@ import {
   toTgError,
   type PubSubBackend,
 } from "@trustgraph/base";
-import { makeDispatcherManager, type DispatcherManager } from "./dispatch/manager.js";
+import { GatewayWorkbenchHttpApi } from "@trustgraph/client/rpc/contract";
+import { makeDispatcherManagerScoped, type DispatcherManager } from "./dispatch/manager.js";
 import { makeGatewayRpcServer, type GatewayRpcServer } from "./rpc-server.js";
 
 export interface GatewayConfig {
@@ -134,6 +136,22 @@ const workbenchDispatch = (
     ),
   );
 
+const gatewayWorkbenchHttpApiRoutes = (
+  config: GatewayConfig,
+  dispatcher: DispatcherManager,
+) => {
+  const handlers = HttpApiBuilder.group(
+    GatewayWorkbenchHttpApi,
+    "workbench",
+    (handlers) =>
+      handlers.handleRaw("dispatch", () => workbenchDispatch(config, dispatcher)),
+  );
+
+  return HttpApiBuilder.layer(GatewayWorkbenchHttpApi).pipe(
+    Layer.provide(handlers),
+  );
+};
+
 const globalDispatch = (
   config: GatewayConfig,
   dispatcher: DispatcherManager,
@@ -240,7 +258,7 @@ export const makeGatewayRoutes = (
   rpcScope: Scope.Scope,
 ) =>
   Layer.mergeAll(
-    HttpRouter.add("POST", "/api/v1/workbench/dispatch", workbenchDispatch(config, dispatcher)),
+    gatewayWorkbenchHttpApiRoutes(config, dispatcher),
     HttpRouter.add("POST", "/api/v1/:kind", globalDispatch(config, dispatcher)),
     HttpRouter.add("POST", "/api/v1/flow/:flow/service/:kind", flowDispatch(config, dispatcher)),
     HttpRouter.add("POST", "/api/v1/flow/:flow/load", flowLoad(config, dispatcher)),
@@ -251,7 +269,7 @@ export const makeGatewayRoutes = (
 export function createGateway(config: GatewayConfig) {
   return Layer.effectDiscard(
     Effect.scoped(Effect.gen(function* () {
-      const dispatcher = makeDispatcherManager(config);
+      const dispatcher = yield* makeDispatcherManagerScoped(config);
       yield* dispatcher.start.pipe(
         Effect.mapError((cause) => messagingLifecycleError("gateway", "dispatcher-start", cause)),
       );

ts/packages/flow/tsconfig.json

@@ -9,6 +9,7 @@
   "include": ["src"],
   "exclude": ["src/**/*.test.ts", "src/**/*.spec.ts"],
   "references": [
-    { "path": "../base" }
+    { "path": "../base" },
+    { "path": "../client" }
   ]
 }