Plugins: remove public extension-api surface (#48462)

* Plugins: remove public extension-api surface

* Plugins: fix loader setup routing follow-ups

* CI: ignore non-extension helper dirs in extension-fast

* Docs: note extension-api removal as breaking

extensions/llm-task/src/llm-task-tool.test.ts

@@ -1,17 +1,11 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
-
-vi.mock("openclaw/extension-api", () => {
-  return {
-    runEmbeddedPiAgent: vi.fn(async () => ({
-      meta: { startedAt: Date.now() },
-      payloads: [{ text: "{}" }],
-    })),
-  };
-});
-
-import { runEmbeddedPiAgent } from "openclaw/extension-api";
 import { createLlmTaskTool } from "./llm-task-tool.js";
 
+const runEmbeddedPiAgent = vi.fn(async () => ({
+  meta: { startedAt: Date.now() },
+  payloads: [{ text: "{}" }],
+}));
+
 // oxlint-disable-next-line typescript/no-explicit-any
 function fakeApi(overrides: any = {}) {
   return {
@@ -22,7 +16,12 @@ function fakeApi(overrides: any = {}) {
       agents: { defaults: { workspace: "/tmp", model: { primary: "openai-codex/gpt-5.2" } } },
     },
     pluginConfig: {},
-    runtime: { version: "test" },
+    runtime: {
+      version: "test",
+      agent: {
+        runEmbeddedPiAgent,
+      },
+    },
     logger: { debug() {}, info() {}, warn() {}, error() {} },
     registerTool() {},
     ...overrides,

extensions/llm-task/src/llm-task-tool.ts

@@ -2,7 +2,6 @@ import fs from "node:fs/promises";
 import path from "node:path";
 import { Type } from "@sinclair/typebox";
 import Ajv from "ajv";
-import { runEmbeddedPiAgent } from "openclaw/extension-api";
 import {
   formatThinkingLevels,
   formatXHighModelHint,
@@ -179,7 +178,7 @@ export function createLlmTaskTool(api: OpenClawPluginApi) {
         const sessionId = `llm-task-${Date.now()}`;
         const sessionFile = path.join(tmpDir, "session.json");
 
-        const result = await runEmbeddedPiAgent({
+        const result = await api.runtime.agent.runEmbeddedPiAgent({
           sessionId,
           sessionFile,
           workspaceDir: api.config?.agents?.defaults?.workspace ?? process.cwd(),