diff --git a/Agent.md b/Agent.md
index fe54cf5..721cbb6 100644
--- a/Agent.md
+++ b/Agent.md
@@ -66,7 +66,7 @@ EMRG is a self-evolving AI agent architecture experiment. Python implementation,
   - Streaming chat with delta rendering (16ms batching), markdown on done (marked + DOMPurify + local highlight.js subset), tool call status cards (2000-char truncation + expand)
   - Session list/switch/new/delete + right-click rename (context menu, #423) synced with daemon; own-stream busy lock (G65); broadcast streams from other clients tagged "来自其他客户端"
   - Disconnect/reconnect: red status dot, auto daemon respawn (stale-port detection), session resume, input bar restored on disconnect (no 30s fake-timeout)
-  - Unit tests `npm test` (176: 43 daemon_client + 19 conn-manager + 22 app-commands + 57 renderer smoke + 15 i18n + 7 integration + 3 commands + 3 build-config + 7 gui-state); RESPONSE_TYPES mirror daemon protocol verified against `daemon.py`
+  - Unit tests `npm test` (178: 43 daemon_client + 19 conn-manager + 22 app-commands + 59 renderer smoke + 15 i18n + 7 integration + 3 commands + 3 build-config + 7 gui-state); RESPONSE_TYPES mirror daemon protocol verified against `daemon.py`
 - **Auto project tracking** — Automatically detects and records working directories; project-scoped sessions
 - **Rant-driven evolution** — User feedback via `/rant` drives automatic self-improvement cycles
 - **Headless GitHub auth** — Non-interactive evolution auto-extracts `GH_TOKEN` from git credential store (osxkeychain / credential helper); PR comment/LGTM queries fall back to REST API (GraphQL needs `read:org` scope)
@@ -94,7 +94,7 @@ pkill -f "emrg.server"; rm -f ~/.emrg/emrgd.port; python -m emrg
 ```
 
 Python: `uv run pytest tests/ -v` (681) — import check: `uv run python -c "from emrg.client.app import run_client"`
-GUI: `cd emrg/gui && npm test` (176: 43 daemon_client + 19 conn-manager + 22 app-commands + 57 renderer smoke + 15 i18n + 7 integration + 3 commands + 3 build-config + 7 gui-state) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
+GUI: `cd emrg/gui && npm test` (178: 43 daemon_client + 19 conn-manager + 22 app-commands + 59 renderer smoke + 15 i18n + 7 integration + 3 commands + 3 build-config + 7 gui-state) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
 CI: `uv run pytest` + GUI tests + **actionlint workflow lint** (`rhysd/actionlint@v1.7.12` gate, #444 — workflow 解析错误在 PR CI 即失败，如 `if:` secrets 上下文)
 Re-trigger: `scripts/re-trigger-ci.sh [branch]` (workflow_dispatch, #527 — 替代空 commit 重触发：Actions outage 会整段丢弃 push 事件，dispatch 走 API 路径不受影响)
 
diff --git a/README.cn.md b/README.cn.md
index b6aedbd..724b9b7 100644
--- a/README.cn.md
+++ b/README.cn.md
@@ -282,7 +282,7 @@ uv run python -m emrg     # 启动 TUI
 cd emrg/gui
 npm ci               # 安装依赖（生产模式可 --omit=dev）
 npm start            # 启动 GUI（自动拉起 daemon）
-npm test             # 运行 Node 测试（176 项：43 daemon_client + 19 conn-manager + 22 app-commands + 57 renderer smoke + 15 i18n + 7 integration + 3 commands + 3 build-config + 7 gui-state；集成测试在 CI 跑，本地可 npm run test:integration）
+npm test             # 运行 Node 测试（178 项：43 daemon_client + 19 conn-manager + 22 app-commands + 59 renderer smoke + 15 i18n + 7 integration + 3 commands + 3 build-config + 7 gui-state；集成测试在 CI 跑，本地可 npm run test:integration）
 ```
 
 CI 通过 GitHub Actions 自动运行测试并检查冲突标记（`.github/workflows/test.yml`）。
diff --git a/README.md b/README.md
index a8575c9..666e849 100644
--- a/README.md
+++ b/README.md
@@ -281,7 +281,7 @@ uv run python -m emrg     # launch TUI
 cd emrg/gui
 npm ci               # install deps (production: --omit=dev)
 npm start            # launch GUI (auto-starts daemon)
-npm test             # run Node tests (176: 43 daemon_client + 19 conn-manager + 22 app-commands + 57 renderer smoke + 15 i18n + 7 integration + 3 commands + 3 build-config + 7 gui-state; integration runs in CI, local: npm run test:integration)
+npm test             # run Node tests (178: 43 daemon_client + 19 conn-manager + 22 app-commands + 59 renderer smoke + 15 i18n + 7 integration + 3 commands + 3 build-config + 7 gui-state; integration runs in CI, local: npm run test:integration)
 ```
 
 CI runs tests and checks for conflict markers automatically via GitHub Actions (`.github/workflows/test.yml`).
diff --git a/emrg/gui/renderer/js/dialogs.js b/emrg/gui/renderer/js/dialogs.js
index 7685a10..834ab4a 100644
--- a/emrg/gui/renderer/js/dialogs.js
+++ b/emrg/gui/renderer/js/dialogs.js
@@ -555,6 +555,9 @@ const Dialogs = (() => {
         const hint = el("span", { class: "help-hint" }, p.path || "");
         pick.appendChild(name);
         pick.appendChild(hint);
+        // P6 验收补完：项目行显示"最近活跃"相对时间（消费 daemon latest_session_at）
+        const act = relTime(p.latest_session_at);
+        if (act) pick.appendChild(el("span", { class: "help-hint" }, act));
         // P5 slice 2：点击打开会话（带项目路径 → resume 用该项目 cwd）
         pick.addEventListener("click", () => showProjectSessions(p));
         row.appendChild(pick);
@@ -674,6 +677,9 @@ const Dialogs = (() => {
         const hint = el("span", { class: "help-hint" }, p.path || "");
         row.appendChild(name);
         row.appendChild(hint);
+        // P6 验收补完：项目行显示"最近活跃"相对时间
+        const act = relTime(p.latest_session_at);
+        if (act) row.appendChild(el("span", { class: "help-hint" }, act));
         row.addEventListener("click", async () => {
           $("new-session-dialog").close();
           await App.newSession({ projectPath: p.path });
diff --git a/emrg/gui/renderer/js/i18n.js b/emrg/gui/renderer/js/i18n.js
index 8122e78..ce4b84f 100644
--- a/emrg/gui/renderer/js/i18n.js
+++ b/emrg/gui/renderer/js/i18n.js
@@ -156,6 +156,10 @@ const I18N = (() => {
       "deleteProject.protectedBody": "「{name}」是系统项目，不可删除。",
       "deleteProject.removed": "项目已删除：{name}",
       "deleteProject.failed": "删除项目失败：{msg}",
+      "relTime.justNow": "刚刚",
+      "relTime.minutesAgo": "{n} 分钟前",
+      "relTime.hoursAgo": "{n} 小时前",
+      "relTime.daysAgo": "{n} 天前",
       "rewind.title": "回退到历史消息点",
       "rewind.desc": "选择要保留到的消息点，之后的对话将被移除。",
       "rewind.cancel": "取消",
@@ -477,6 +481,10 @@ const I18N = (() => {
       "deleteProject.protectedBody": "\"{name}\" is a system project and cannot be deleted.",
       "deleteProject.removed": "Project removed: {name}",
       "deleteProject.failed": "Failed to delete project: {msg}",
+      "relTime.justNow": "just now",
+      "relTime.minutesAgo": "{n} min ago",
+      "relTime.hoursAgo": "{n} h ago",
+      "relTime.daysAgo": "{n} d ago",
       "rewind.title": "Rewind to a history point",
       "rewind.desc": "Choose the message point to keep — later messages will be removed.",
       "rewind.cancel": "Cancel",
diff --git a/emrg/gui/renderer/js/utils.js b/emrg/gui/renderer/js/utils.js
index 42f93e7..9296f76 100644
--- a/emrg/gui/renderer/js/utils.js
+++ b/emrg/gui/renderer/js/utils.js
@@ -73,6 +73,25 @@ function applyTheme(mode) {
   }
 }
 
+/**
+ * 相对时间（P6 验收补完：项目行"最近活跃"提示，消费 daemon list_projects 的
+ * latest_session_at）。ISO 时间串 → "刚刚 / {n} 分钟前 / {n} 小时前 / {n} 天前"，
+ * 走 i18n（zh/en）；缺失/非法输入返回空串（调用点自行隐藏）。
+ */
+function relTime(iso) {
+  if (!iso) return "";
+  const then = new Date(iso).getTime();
+  if (Number.isNaN(then)) return "";
+  const diffMin = Math.floor((Date.now() - then) / 60000);
+  const t = (window.EMRG_I18N && window.EMRG_I18N.t) || ((k) => k);
+  if (diffMin < 1) return t("relTime.justNow");
+  if (diffMin < 60) return t("relTime.minutesAgo", { n: diffMin });
+  const hrs = Math.floor(diffMin / 60);
+  if (hrs < 24) return t("relTime.hoursAgo", { n: hrs });
+  const days = Math.floor(hrs / 24);
+  return t("relTime.daysAgo", { n: days });
+}
+
 // 显式挂载到 window（多 script 顺序加载共享全局，显式挂载更健壮）
 window.$ = $;
 window.el = el;
@@ -80,3 +99,4 @@ window.escapeHtml = escapeHtml;
 window.genRequestId = genRequestId;
 window.groupLabel = groupLabel;
 window.applyTheme = applyTheme;
+window.relTime = relTime;
diff --git a/emrg/gui/test/renderer.smoke.test.js b/emrg/gui/test/renderer.smoke.test.js
index 6a0b22c..8f18862 100644
--- a/emrg/gui/test/renderer.smoke.test.js
+++ b/emrg/gui/test/renderer.smoke.test.js
@@ -1497,3 +1497,48 @@ test("P6: model_set 多连接重复广播幂等 — 状态一致、无副作用
   await vm.runInContext('App.handleEvent({ type: "command_result", sid: "conn-c", data: { type: "model_set", model: "m2" } });', ctx);
   assert.strictEqual(ctx.App.state.model, "m2", "still idempotent after third broadcast");
 });
+
+// ── P6 验收补完（rant 15:07:19）：relTime 相对时间助手 + 项目行最近活跃提示 ──
+
+test("P6: relTime 相对时间 — 刚刚/分钟/小时/天 + 无效输入空串", async () => {
+  const { ctx } = makeSandbox({});
+  await tick();
+  const out = vm.runInContext(`(function(){
+    const now = Date.now();
+    return {
+      justNow: relTime(new Date(now).toISOString()),
+      mins: relTime(new Date(now - 5 * 60000).toISOString()),
+      hrs: relTime(new Date(now - 3 * 3600000).toISOString()),
+      days: relTime(new Date(now - 2 * 86400000).toISOString()),
+      none: relTime(""),
+      bad: relTime("not-a-date"),
+    };
+  })()`, ctx);
+  assert.strictEqual(out.justNow, "刚刚", "just now");
+  assert.strictEqual(out.mins, "5 分钟前", "5 minutes ago");
+  assert.strictEqual(out.hrs, "3 小时前", "3 hours ago");
+  assert.strictEqual(out.days, "2 天前", "2 days ago");
+  assert.strictEqual(out.none, "", "empty input → empty");
+  assert.strictEqual(out.bad, "", "invalid input → empty");
+});
+
+test("P6: 打开会话弹窗项目行显示最近活跃提示（latest_session_at）", async () => {
+  const projects = [
+    { name: "mem", path: "/p/mem", latest_session_at: new Date(Date.now() - 5 * 60000).toISOString() },
+    { name: "emrg", path: "/p/emrg" }, // 无 latest_session_at → 不显示
+  ];
+  const { ctx, els } = makeSandbox({ listProjects: async () => projects });
+  await tick();
+  await vm.runInContext("EMRG_Dialogs.showOpenSessionDialog()", ctx);
+  await tick();
+  const rows = els["open-session-list"].children;
+  assert.strictEqual(rows.length, 2, "two project rows");
+  // 行 0 = div[pick, del]；pick 子节点含 name/path/act hint（relTime 5 分钟前）
+  const pick0 = rows[0].children[0];
+  const texts0 = [...pick0.children].map((c) => c.textContent || "");
+  assert.ok(texts0.includes("5 分钟前"), "recent activity hint shown, got: " + texts0.join(","));
+  // 行 1 无 latest_session_at → 无活动提示
+  const pick1 = rows[1].children[0];
+  const texts1 = [...pick1.children].map((c) => c.textContent || "");
+  assert.ok(!texts1.some((t) => t.includes("前") || t.includes("ago")), "no activity hint when absent");
+});
diff --git a/emrg/server/evolution_prompt.md b/emrg/server/evolution_prompt.md
index 0ea3f41..fe01a11 100644
--- a/emrg/server/evolution_prompt.md
+++ b/emrg/server/evolution_prompt.md
@@ -399,6 +399,7 @@ When reading rants, follow these rules:
 > - GUI new-session dialog + delete-project protected guard (#642 GUI 多会话 rant 2026-08-10T15:07:19 P5 slice 2：**新建会话弹窗** `showNewSessionDialog`（listProjects 活跃序 → 点选即 `App.newSession({projectPath})`；底部"＋ 新建项目…" → pickProjectDir → registerProject → 同路径新建）+ index.html `#new-session-dialog` + 打开弹窗顶部"＋ 新建会话…"入口；**删除项目**：打开弹窗项目行右侧删除按钮 → 受保护守卫（内置 project `emrg` / 内置 task `emrg-task` 提示"系统项目不可删除"，不调 API；`.emrg` 非内置可删）→ 确认弹窗（数据保留可恢复）→ main.js `emrg:removeProject` IPC（关闭该项目已打开会话连接 + 移出簿记 + 写盘 + 激活被关 → renderer 切相邻/新建 + 广播 open_sessions）→ daemon `remove_project`（P1 已备）；**slice-1 补洞**：switchSession/sendMessage 带 per-session projectPath（跨项目 resume 用项目 cwd 非全局 projectDir）；newSession 接受 projectPath（首条消息前即记簿记）；i18n zh/en 11 条；+3 测试 renderer.smoke 52→55（新建会话选项目 / 新建项目→注册→新建 / 删除项目受保护+普通确认）；GUI 169→172 三文档同步；680 pytest 全绿；P5 完成，P6 收尾待续) ✅
 > - GUI multi-session P6 finalize (#643 GUI 多会话 rant 2026-08-10T15:07:19 收尾边界：①**关闭在忙连接先 cancel 再 close**——ConnManager.close() 检测 `conn.ownStream && conn.ws` 先发 cancel（fire-and-forget 吞断连异常，不阻塞同步 close 语义），防流式半途断线留脏状态；②**上限 20 超限提示不自动关**——switchSession 显式打开新会话时 `openSessions.size >= DEFAULT_CAP && !openSessions.has(sid)` → 抛 "too many open sessions (20) — close some first"（已打开 sid 复用不拦；sendMessage/newSession 创建路径不拦）；renderer 识别该错误 → 本地化 `app.tooManyOpenSessions` zh/en（不再漏英文原始错误）；③**projectPath 校验**——switchSession/newSession IPC 收 projectPath 时校验 string 非空；+3 测试（conn-manager 17→19：忙 close 发 cancel / 空闲 close 不 cancel；renderer.smoke 55→56：超限本地化提示）；GUI 172→175 三文档同步；680 pytest 全绿；P1-P6 全部完成，验收清单剩余宿主实测项) ✅
 > - GUI multi-session acceptance completion (#644 GUI 多会话 rant 2026-08-10T15:07:19 验收补完两件：①**项目按最新会话活跃倒序**——daemon `_handle_list_projects` 并行扫描各项目 `<path>/.emrg/sessions/*/meta.json` 取最大 created_at（asyncio.gather），projects 响应带 `latest_session_at` 并倒序（此前 projects.yml 按 path 排序、list_projects 按文件序返回，打开/新建会话弹窗"按最近活跃"的验收项实际未满足）；GUI 单连接无法并发 list_sessions（DaemonClient `_pending` 按 respType 键控互相覆盖）→ daemon 侧聚合的正确架构；/rant 项目列表同步受益（最近活跃置顶）；②**model_set 多连接重复广播幂等测试**——renderer.smoke 新增两/三连接同值广播：state.model 不变、无新系统消息、model-switcher-label 一致（验收"model_set 多连接重复收无副作用"）；+2 测试（pytest 680→681、renderer.smoke 55→56）GUI 172→173、三文档同步；681 pytest 全绿；P1-P6 验收项仅剩宿主实测类) ✅
+> - GUI project-row recent-activity hints (#646 GUI 多会话 rant 2026-08-10T15:07:19 验收体验补完：打开/新建会话弹窗项目行显示"最近活跃"相对时间——utils.js 新增 `relTime(iso)`（ISO → "刚刚/N 分钟前/N 小时前/N 天前"，走 i18n zh/en，缺失/非法输入返回空串）；dialogs.js showOpenSessionDialog + showNewSessionDialog 项目行消费 daemon `latest_session_at`（#644 新增字段）追加 hint span（无字段不显示）；i18n zh/en 4 键（relTime.*）；+2 测试 renderer.smoke 57→59（relTime 六态：刚刚/分钟/小时/天/空/非法 + 弹窗行活动提示/无字段不显示）；GUI 176→178 三文档同步；681 pytest 全绿；"按最近活跃排序"从隐式排序变为可见提示，宿主可感知排序依据) ✅
 
 #### 2.2 Latest GitHub code changes