chore(acpx): move runtime test fixtures to test-utils (openclaw#40548)

Verified:
- pnpm install --frozen-lockfile
- pnpm build
- pnpm check
- pnpm test:macmini

CHANGELOG.md

@@ -6,6 +6,7 @@ Docs: https://docs.openclaw.ai
 
 ### Changes
 
+- Extensions/ACPX tests: move the shared runtime fixture helper from `src/runtime-internals/` to `src/test-utils/` so the test-only helper no longer looks like shipped runtime code.
 - TUI: infer the active agent from the current workspace when launched inside a configured agent workspace, while preserving explicit `agent:` session targets. (#39591) thanks @arceus77-7.
 - Tools/Brave web search: add opt-in `tools.web.search.brave.mode: "llm-context"` so `web_search` can call Brave's LLM Context endpoint and return extracted grounding snippets with source metadata, plus config/docs/test coverage. (#33383) Thanks @thirumaleshp.
 - Talk mode: add top-level `talk.silenceTimeoutMs` config so Talk waits a configurable amount of silence before auto-sending the current transcript, while keeping each platform's existing default pause window when unset. (#39607) Thanks @danodoesdesign. Fixes #17147.

extensions/acpx/src/runtime.test.ts

@@ -2,13 +2,13 @@ import os from "node:os";
 import path from "node:path";
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
 import { runAcpRuntimeAdapterContract } from "../../../src/acp/runtime/adapter-contract.testkit.js";
+import { AcpxRuntime, decodeAcpxRuntimeHandleState } from "./runtime.js";
 import {
   cleanupMockRuntimeFixtures,
   createMockRuntimeFixture,
   NOOP_LOGGER,
   readMockRuntimeLogEntries,
-} from "./runtime-internals/test-fixtures.js";
+} from "./test-utils/runtime-fixtures.js";
-import { AcpxRuntime, decodeAcpxRuntimeHandleState } from "./runtime.js";
 
 let sharedFixture: Awaited<ReturnType<typeof createMockRuntimeFixture>> | null = null;
 let missingCommandRuntime: AcpxRuntime | null = null;