feat(FN-3207): remove runtime memory-backend side-load

Merged FN-3207 and FN-3242: streamlined the memory backend by removing the runtime side-load pattern in `project-memory.ts` (simplified from 25+ lines), added regression tests across core, engine, and CLI bundle to catch the import issue at build time, and updated ChatView with a CSS fix for file me

Fusion-Task-Id: FN-3207

packages/core/src/__tests__/project-memory.test.ts

@@ -13,6 +13,7 @@ import {
   readProjectMemory,
   readProjectMemoryWithBackend,
   searchProjectMemory,
+  getProjectMemory,
   resolveMemoryInstructionContext,
 } from "../project-memory.js";
 
@@ -649,4 +650,45 @@ describe("project-memory", () => {
       expect(results.some((result) => result.path === ".fusion/memory/DREAMS.md")).toBe(true);
     });
   });
+
+  describe("getProjectMemory", () => {
+    it("reads bounded memory window via file backend", async () => {
+      const memoryDir = join(testDir, ".fusion", "memory");
+      await mkdir(memoryDir, { recursive: true });
+      await writeFile(
+        join(memoryDir, "MEMORY.md"),
+        "# Memory\nline-a\nline-b\nline-c\nline-d\n",
+        "utf-8",
+      );
+
+      const result = await getProjectMemory(
+        testDir,
+        { path: ".fusion/memory/MEMORY.md", startLine: 2, lineCount: 2 },
+        { memoryBackendType: "file" },
+      );
+
+      expect(result.path).toBe(".fusion/memory/MEMORY.md");
+      expect(result.content).toBe("line-a\nline-b");
+      expect(result.startLine).toBe(2);
+      expect(result.endLine).toBe(3);
+      expect(result.totalLines).toBeGreaterThanOrEqual(5);
+      expect(result.backend).toBe("file");
+    });
+
+    it("returns qmd backend marker for memory_get contract", async () => {
+      const memoryDir = join(testDir, ".fusion", "memory");
+      await mkdir(memoryDir, { recursive: true });
+      await writeFile(join(memoryDir, "MEMORY.md"), "# Memory\nqmd-line\n", "utf-8");
+
+      const result = await getProjectMemory(
+        testDir,
+        { path: ".fusion/memory/MEMORY.md", startLine: 1, lineCount: 5 },
+        { memoryBackendType: "qmd" },
+      );
+
+      expect(result.path).toBe(".fusion/memory/MEMORY.md");
+      expect(result.content).toContain("qmd-line");
+      expect(result.backend).toBe("qmd");
+    });
+  });
 });

packages/core/src/project-memory.ts

@@ -24,6 +24,10 @@ import { existsSync } from "node:fs";
 import {
   ensureOpenClawMemoryFiles,
   memoryLongTermPath,
+  resolveMemoryBackend,
+  MEMORY_BACKEND_SETTINGS_KEYS,
+  DEFAULT_MEMORY_BACKEND,
+  scheduleQmdInstallAndRefresh,
   type MemorySearchOptions,
   type MemorySearchResult,
   type MemoryGetOptions,
@@ -93,17 +97,6 @@ type MemorySettings = {
   [key: string]: unknown;
 };
 
-// Import memory backend utilities lazily to avoid circular dependencies
-async function getMemoryBackendUtils() {
-  const module = await import("./memory-backend.js");
-  return {
-    resolveMemoryBackend: module.resolveMemoryBackend,
-    getMemoryBackendCapabilities: module.getMemoryBackendCapabilities,
-    MEMORY_BACKEND_SETTINGS_KEYS: module.MEMORY_BACKEND_SETTINGS_KEYS,
-    DEFAULT_MEMORY_BACKEND: module.DEFAULT_MEMORY_BACKEND,
-    scheduleQmdInstallAndRefresh: module.scheduleQmdInstallAndRefresh,
-  };
-}
 
 // ── Memory Instruction Context ─────────────────────────────────────────
 
@@ -236,13 +229,6 @@ export async function ensureMemoryFileWithBackend(
   rootDir: string,
   settings?: MemorySettings,
 ): Promise<boolean> {
-  const {
-    resolveMemoryBackend,
-    MEMORY_BACKEND_SETTINGS_KEYS,
-    DEFAULT_MEMORY_BACKEND,
-    scheduleQmdInstallAndRefresh,
-  } = await getMemoryBackendUtils();
-
   const backendType =
     (settings?.[MEMORY_BACKEND_SETTINGS_KEYS.MEMORY_BACKEND_TYPE] as string) ||
     DEFAULT_MEMORY_BACKEND;
@@ -296,7 +282,6 @@ export async function readProjectMemoryWithBackend(
   rootDir: string,
   settings?: MemorySettings,
 ): Promise<string> {
-  const { resolveMemoryBackend } = await getMemoryBackendUtils();
   const backend = resolveMemoryBackend(settings);
 
   try {
@@ -313,7 +298,6 @@ export async function searchProjectMemory(
   options: MemorySearchOptions,
   settings?: MemorySettings,
 ): Promise<MemorySearchResult[]> {
-  const { resolveMemoryBackend } = await getMemoryBackendUtils();
   const backend = resolveMemoryBackend(settings);
   if (!backend.search) {
     return [];
@@ -326,7 +310,6 @@ export async function getProjectMemory(
   options: MemoryGetOptions,
   settings?: MemorySettings,
 ): Promise<MemoryGetResult> {
-  const { resolveMemoryBackend } = await getMemoryBackendUtils();
   const backend = resolveMemoryBackend(settings);
   if (!backend.get) {
     throw new Error(`Memory backend '${backend.type}' does not support memory_get`);