LLM-driven 设计，添加学习审计和会话历史存储至目录的功能

src/audit/learningAudit.ts

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+import { appendFile, mkdir } from "node:fs/promises";
+import { dirname } from "node:path";
+
+import { config } from "../config.js";
+
+export type LearningAuditEntry = {
+  action: string;
+  detail?: string;
+  outcome: "accepted" | "error" | "rejected" | "skipped";
+  projectId?: string;
+  proposal?: Record<string, unknown>;
+  sessionId: string;
+  traceId?: string;
+};
+
+let logDirectoryReadyPromise: Promise<void> | null = null;
+
+const ensureLogDirectory = async () => {
+  if (!logDirectoryReadyPromise) {
+    logDirectoryReadyPromise = mkdir(dirname(config.LEARNING_AUDIT_LOG_PATH), {
+      recursive: true,
+    }).then(() => undefined);
+  }
+  await logDirectoryReadyPromise;
+};
+
+export const writeLearningAuditLog = async (entry: LearningAuditEntry) => {
+  await ensureLogDirectory();
+  const line = JSON.stringify({
+    timestamp: new Date().toISOString(),
+    ...entry,
+  });
+  await appendFile(config.LEARNING_AUDIT_LOG_PATH, `${line}\n`, "utf8");
+};