fix(sessions): archiving a live session stops its pane

Archive on a session a live pane held only hid its row, and the list
deliberately does not bring such a tab back, so the pane kept running
with nothing on screen showing it — a member archived five sessions
believing them closed and kept ~2.7 GB of claude/omp/postgres-mcp alive
for up to two days. Archive on a live session is now a Stop (endRuns,
the tab X's confirm, DELETE /api/run/:id?archive=1) in the sidebar row,
the workspace home's Recents and their right-click menu.

client/src/components/__tests__/WorkspaceTree.test.tsx

@@ -3,7 +3,8 @@
  * @description Tests for the sidebar's workspace list: one flat row per
  * workspace in the stored order, a row expanding to its sessions (remembered),
  * a live session opening its pane and an ended one its transcript, the
- * workspace's OWN sessions only, a session's state dot, rename and archive,
+ * workspace's OWN sessions only, a session's state dot, rename and archive
+ * (a live one's pane stopped first),
  * selection
  * by URL, Alt+arrow reordering kept in localStorage, double-click rename, the
  * search, the row menu's items by kind and tool, the status dot, and the
@@ -225,6 +226,8 @@ describe("WorkspaceTree", () => {
     await user.type(input, "Better name{Enter}");
     expect(api.sessions.patch).toHaveBeenCalledWith("s-old", { name: "Better name" });
     await user.click(screen.getByTestId("workspace-session-archive-s-live"));
+    // A live session's Archive stops its pane first — never a hidden pane left running.
+    expect(api.run.kill).toHaveBeenCalledWith("agenthub-lane-1-2", { archive: true });
     expect(api.sessions.patch).toHaveBeenCalledWith("s-live", { archived: true });
   });
 

client/src/components/lanes/WorkspaceHome.tsx

@@ -14,7 +14,7 @@
  * a catalog tool's bypass — a YOLO chip for Codex) and Local / New worktree — the workspace's Recents — the sessions it
  * owns and has not archived (`?lane=&archived=0`, with each one's state dot,
  * **Show more** past the first page, and the sidebar row's Rename/Archive in
- * its right-click menu), then the archived ones folded with Unarchive; a live session opens its pane,
+ * its right-click menu — Archive on a live session stops its pane first, `endRuns`), then the archived ones folded with Unarchive; a live session opens its pane,
  * any other its conversation (`&session=`, `SessionReplay`), nothing is resumed — and on the right its context: Instructions, Memory (read-only), Context files and
  * Folders (`WorkspaceContext.tsx`, also folded at the bottom of the Changes panel).
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
@@ -22,6 +22,7 @@
 
 import { isSubmitEnter } from "../../lib/keys";
 import { confirmDialog } from "../../lib/confirm";
+import { endRuns } from "../../lib/stopSession";
 import { useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { useNavigate } from "react-router-dom";
@@ -307,30 +308,30 @@ function HomeBody({
     }
   };
   const archiveSession = async (s: Session) => {
-    const live = !!liveRunFor(lane, liveRuns, s.id);
+    const run = liveRunFor(lane, liveRuns, s.id);
+    // A live one is stopped first, as the tab's X does (its own confirm):
+    // archiving only its row left a pane running that no list showed.
+    if (run) {
+      if ((await endRuns([run], { name: s.name || t("tree.newSession"), t })).length)
+        await patchSession(s, { archived: true });
+      return;
+    }
     const wt = sessionWorktreeName(lane, s);
     const ok = await confirmDialog(
-      wt && !live
+      wt
         ? {
             title: t("tree.archiveWorktreeTitle"),
             message: t("tree.archiveWorktreeBody", { name: wt }),
             confirmLabel: t("tree.archiveWorktreeConfirm"),
           }
-        : live
-          ? {
-              title: t("tree.archiveLiveTitle"),
-              message: t("tree.archiveLiveBody"),
-              confirmLabel: t("sessionMenu.archive"),
-              destructive: false,
-            }
-          : {
-              title: t("tree.archiveSession"),
-              confirmLabel: t("sessionMenu.archive"),
-              destructive: false,
-            }
+        : {
+            title: t("tree.archiveSession"),
+            confirmLabel: t("sessionMenu.archive"),
+            destructive: false,
+          }
     );
     if (!ok) return;
-    if (wt && !live) {
+    if (wt) {
       try {
         await api.lanes.removeSessionWorktree(lane.id, s.id).catch((err: unknown) => {
           if ((err as { code?: string }).code !== "ENOWORKTREE") throw err;

client/src/components/lanes/WorkspaceSessionList.tsx

@@ -24,7 +24,7 @@
  * The list shows `SESSION_LIMIT` rows and a **See all (N more)** under them that
  * loads every one, then a **Show less** that goes back to `SESSION_LIMIT`. A
  * live tab whose session was archived is not brought back as a New session,
- * and archiving a live one asks first. F2 renames the focused row too; each
+ * and archiving a live one STOPS it first (`endRuns`, the tab X's confirm). F2 renames the focused row too; each
  * dot carries its meaning as screen-reader text. `readOnly` (another user's
  * workspace, for an analyst): no live tabs, no rename/archive/menu, and a row
  * opens the session's analysis page (`/sessions/<id>`) — never a pane or a resume.
@@ -32,7 +32,7 @@
  */
 
 import { useEffect, useState, type ReactNode } from "react";
-import { confirmDialog } from "../../lib/confirm";
+import { endRuns } from "../../lib/stopSession";
 import { isSubmitEnter } from "../../lib/keys";
 import { Archive, GitBranch, Pin, PinOff, SquareTerminal } from "lucide-react";
 import { useTranslation } from "react-i18next";
@@ -363,17 +363,10 @@ export function WorkspaceSessionList({
   };
   const archive = async (s: Session) => {
     if (sessionWorktreeName(lane, s) && !runFor(s)) return setArchiving(s);
-    // A live one keeps running in its tab; archiving only hides its row.
-    if (
-      runFor(s) &&
-      !(await confirmDialog({
-        title: t("tree.archiveLiveTitle"),
-        message: t("tree.archiveLiveBody"),
-        confirmLabel: t("sessionMenu.archive"),
-        destructive: false,
-      }))
-    )
-      return;
+    // A live one is stopped first, as the tab's X does: archiving only its row
+    // left a pane running that no list showed any more.
+    const run = runFor(s);
+    if (run && !(await endRuns([run], { name: s.name || t("tree.newSession"), t })).length) return;
     await patch(s, { archived: true });
   };
   const archiveWithWorktree = async (s: Session) => {

client/src/i18n/locales/en/lanes.json

@@ -505,8 +505,6 @@
   "changes.loadMore": "Load more commits",
   "changes.commentPasted": "Pasted into tab {{tab}} — press Enter there to send it",
   "changes.splitter": "Resize the changes panel",
-  "tree.archiveLiveTitle": "Archive a live session?",
-  "tree.archiveLiveBody": "Its tab keeps running; archiving only hides it from this list. Unarchive it from the archived fold.",
   "tree.state.awaiting": "waiting for you",
   "tree.state.error": "error",
   "tree.state.live": "live",

client/src/i18n/locales/vi/lanes.json

@@ -505,8 +505,6 @@
   "changes.loadMore": "Tải thêm commit",
   "changes.commentPasted": "Đã dán vào tab {{tab}} — nhấn Enter ở đó để gửi",
   "changes.splitter": "Đổi độ rộng khung thay đổi",
-  "tree.archiveLiveTitle": "Lưu trữ một session đang chạy?",
-  "tree.archiveLiveBody": "Tab của nó vẫn chạy; lưu trữ chỉ ẩn nó khỏi danh sách này. Bỏ lưu trữ trong mục đã lưu trữ.",
   "tree.state.awaiting": "đang chờ bạn",
   "tree.state.error": "lỗi",
   "tree.state.live": "đang chạy",

client/src/lib/stopSession.ts

@@ -6,7 +6,8 @@
  * message. Both ask first when any pane holds an AI agent (it may be
  * mid-turn); a plain shell holds no session, so it neither asks nor sleeps.
  * Used by the tab bar (`ConsoleTabs`), the split panes (`Workspace`) and a
- * session's right-click menu (`SessionMenu`).
+ * session's right-click menu (`SessionMenu`), and a live session's Archive
+ * (`WorkspaceSessionList`, `WorkspaceHome`) — archiving never leaves a pane running.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */