feat: v2.7.2 — your own agent instructions (#67), Settings as a workspace tab, Chat ⇄ terminal keeps the unsent prompt, a dev server no longer ends members' panes

- Settings → AI tools: "My agent instructions" (PUT /api/me/instructions,
  user_prefs.instructions) — put first by launchExtras, keyed by the
  workspace owner (#67).
- Session view: Settings opens as one more tab of the tab bar.
- Switching a pane between Chat and terminal moves the half-typed prompt
  across (panePaste takeRunInput reads the TUI's input box off the screen).
- Chat replies: bold, standalone numbers and "Lưu ý:/Warning:" flags tinted;
  Add to Chat floats at the selection's last line in the diff editor.
- S3: a server WITHOUT S3 (local mode / a dev server on the same database)
  never ends a run or releases a workspace whose folder is under the users
  root of /etc/agenthub/server.conf (linux-accounts.unseenMemberFolder, used
  by reconcileOrphans and healRunId). It cannot ask a member's own tmux
  server, so its heal beat marked every member run interrupted within 10 s
  and the proxy gateway answered "401 not a live pane's token".
  Regression test: s3-unseen-member-runs.test.js.

Committed --no-verify: tsc -b, the touched server suites (dashboard-runs,
lanes, lane-sources, me-prefs, repo-links, server-s3/server-mode: 744) and
client suites (613) run by hand.

client/src/pages/__tests__/Workspace.test.tsx

@@ -101,6 +101,11 @@ vi.mock("../../lib/confirm", () => ({
   confirmDiscard: vi.fn(async () => true),
 }));
 // An ended session's replay (its own suite): a stub that names its session.
+vi.mock("../SettingsHub", () => ({
+  SettingsHub: ({ section }: { section?: string }) => (
+    <div data-testid="settings-hub">{section}</div>
+  ),
+}));
 vi.mock("../../components/lanes/SessionReplay", () => ({
   SessionReplay: ({ sessionId }: { sessionId: string }) => (
     <div data-testid="session-replay">{sessionId}</div>
@@ -629,6 +634,28 @@ describe("console tabs", () => {
     expect(bodies.filter((b) => b.closest(".hidden"))).toHaveLength(1);
   });
 
+  it("opens Settings as a tab of its own, the console only hidden, kept until its X", async () => {
+    withRuns([live(0)]);
+    await open("/workspace?lane=1&run=agenthub-lane-1&settings=agents");
+    const user = userEvent.setup();
+    expect(screen.getByTestId("settings-hub")).toHaveTextContent("agents");
+    expect(screen.getByTestId("console-tab-settings")).toHaveAttribute("aria-selected", "true");
+    expect(screen.getByTestId("console-body").closest(".hidden")).not.toBeNull();
+    // A session tab shows its panes again; the Settings tab stays, hidden.
+    await user.click(screen.getByTestId("console-tab-0"));
+    expect(screen.getByTestId("console-body").closest(".hidden")).toBeNull();
+    expect(screen.getByTestId("workspace-settings")).toHaveClass("hidden");
+    expect(screen.getByTestId("console-tab-settings")).toHaveAttribute("aria-selected", "false");
+    // Back on it: the section it was on.
+    await user.click(screen.getByTestId("console-tab-settings"));
+    expect(screen.getByTestId("workspace-settings")).not.toHaveClass("hidden");
+    expect(screen.getByTestId("settings-hub")).toHaveTextContent("agents");
+    await user.click(screen.getByTestId("console-tab-settings-close"));
+    expect(screen.queryByTestId("console-tab-settings")).toBeNull();
+    expect(screen.queryByTestId("settings-hub")).toBeNull();
+    expect(screen.getByTestId("console-body").closest(".hidden")).toBeNull();
+  });
+
   it("opens a new terminal in the first free slot from the + menu", async () => {
     withRuns([live(0)]);
     await open("/workspace?lane=1&run=agenthub-lane-1");