Use HashSet for gateway term service sets

ts/EFFECT_NATIVE_REWRITE_AUDIT.md

@@ -420,6 +420,19 @@ Notes:
   - `bun run --cwd ts/packages/client test -- src/__tests__/rpc-timeout.test.ts`
   - `cd ts && bun run check:tsgo`
 
+### 2026-06-04: Gateway Term Service HashSet Slice
+
+- Status: migrated and package-verified.
+- Completed:
+  - `ts/packages/flow/src/gateway/dispatch/serialize.ts` now uses
+    `effect/HashSet` for static term-bearing request/response service
+    membership instead of native `Set`.
+  - Request and response translators preserve the same deep client/internal
+    term conversion behavior via `HashSet.has` membership checks.
+- Verification:
+  - `bun run --cwd ts/packages/flow test -- src/__tests__/gateway-dispatcher.test.ts`
+  - `cd ts && bun run check:tsgo`
+
 ### 2026-06-02: RAG And Agent Requestor Bridge Slice
 
 - Status: migrated, root-verified, committed, and pushed.
@@ -1862,7 +1875,8 @@ Notes:
   - Qdrant graph/doc known-collection caches now use
     `MutableHashSet<string>`. Short-lived local traversal sets remain no-ops.
   - Gateway dispatcher static service registries, streaming membership, and
-    scoped requestor cache now use Effect `HashMap`/`HashSet`.
+    scoped requestor cache now use Effect `HashMap`/`HashSet`; gateway
+    term-bearing service membership sets now use Effect `HashSet` too.
   - FlowManager `() => Effect.gen(...)` factories are normalized to
     `Effect.fn` / `Effect.fnUntraced`. Sibling service factories still need a
     focused scan before treating them as valid migration targets.

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

@@ -29,7 +29,7 @@ import {
   type Term,
   type Triple,
 } from "@trustgraph/base";
-import { Effect, Match } from "effect";
+import { Effect, HashSet, Match } from "effect";
 import * as O from "effect/Option";
 import * as S from "effect/Schema";
 
@@ -251,23 +251,23 @@ function deepInternalToClient(value: unknown): unknown {
  * Services whose requests contain Term/Triple fields that need translation.
  * All other services pass through without term translation.
  */
-const TERM_BEARING_REQUEST_SERVICES = new Set([
+const TERM_BEARING_REQUEST_SERVICES = HashSet.make(
   "triples",
   "knowledge",
   "librarian",
-]);
+);
 
 /**
  * Services whose responses contain Term/Triple fields that need translation.
  */
-const TERM_BEARING_RESPONSE_SERVICES = new Set([
+const TERM_BEARING_RESPONSE_SERVICES = HashSet.make(
   "triples",
   "graph-embeddings",
   "knowledge",
   "librarian",
   "graph-rag",
   "agent",
-]);
+);
 
 // ---------- Top-level request / response translators ----------
 
@@ -280,7 +280,7 @@ const TERM_BEARING_RESPONSE_SERVICES = new Set([
  * scalar fields (query strings, limits, etc.).
  */
 export function translateRequest(service: string, body: unknown): unknown {
-  if (TERM_BEARING_REQUEST_SERVICES.has(service)) {
+  if (HashSet.has(TERM_BEARING_REQUEST_SERVICES, service)) {
     return deepClientToInternal(body);
   }
   return body;
@@ -309,7 +309,7 @@ export const translateRequestEffect = (
  * All other services pass through unchanged.
  */
 export function translateResponse(service: string, response: unknown): unknown {
-  if (TERM_BEARING_RESPONSE_SERVICES.has(service)) {
+  if (HashSet.has(TERM_BEARING_RESPONSE_SERVICES, service)) {
     return deepInternalToClient(response);
   }
   return response;