增加历史版本保存功能

src/memory/store.ts

@@ -3,7 +3,7 @@ import { join } from "node:path";
 import { config } from "../config.js";
 import { sanitizePersistentLine } from "../utils/persistencePolicy.js";
 import {
-  atomicWriteFile,
+  atomicWriteFileWithHistory,
   ensureDirectory,
   readTextFile,
 } from "../utils/fileStore.js";
@@ -37,12 +37,16 @@ const SUSPICIOUS_MEMORY_PATTERNS = [
 export class MemoryStore {
   private writeQueue: Promise<void> = Promise.resolve();
 
-  constructor(private readonly baseDir = config.MEMORY_STORAGE_DIR) {}
+  constructor(
+    private readonly baseDir = config.MEMORY_STORAGE_DIR,
+    private readonly historyDir = join(config.PERSISTENCE_HISTORY_DIR, "memory"),
+  ) {}
 
   async initialize() {
     await ensureDirectory(this.baseDir);
     await ensureDirectory(join(this.baseDir, "users"));
     await ensureDirectory(join(this.baseDir, "workspaces"));
+    await ensureDirectory(this.historyDir);
   }
 
   async upsert(scope: MemoryScope, key: string, draft: MemoryDraft) {
@@ -60,7 +64,14 @@ export class MemoryStore {
 
       const entry: MemoryEntry = { content };
       entries.unshift(entry);
-      await atomicWriteFile(this.filePath(scope, key), renderMemoryMarkdown(scope, entries));
+      await atomicWriteFileWithHistory(
+        this.filePath(scope, key),
+        renderMemoryMarkdown(scope, entries),
+        {
+          historyDir: this.historyDir,
+          rootDir: this.baseDir,
+        },
+      );
       return { changed: true, entry };
     });
   }