chore: v2.8.71 — remote clients (company hub), artifacts shared with chosen people, folders and viewable copies, fixes

Remote clients (docs/plans/remote-clients/README.md, B1–B3 for the Claude pool):
- server/hub/ holds the hub-only code (devices, remote sessions, upload ingest,
  LAN gateway), required only in server mode; hub-boundary.test.js keeps local
  code from importing it.
- A local install enrolls with `agenthub remote login` or Settings → AI tools →
  Company hub; the "Company account" AI Proxy (reserved name agenthub.company)
  sends a session through the hub's gateway, which adds a pool account's token —
  no credential reaches the machine. Only those sessions are uploaded, hourly
  and at their end; secret-shaped strings are redacted on the client.
- Gateway refuses: unknown device (401), a message without a session id, an
  unregistered session under AGENTHUB_REMOTE_GATE=block, a user over quota
  (EQUOTA), a purged session (410). Device tokens 90 days, conversations 30.
- New alert rule type remote_unmonitored: a company-account session its device
  never registered; a late registration clears the flag instead.
- The hub imports a session once per upload round (chunks carry `more`),
  not once per chunk.

Artifacts:
- Share an artifact with chosen people (artifact_shares, PATCH sharedWith,
  GET /api/artifacts/people) besides everyone; a "Shared with you" tab.
  Only the owner or an admin sees or edits who it is shared with; audited.
- Folders: each account's own arrangement (agenthub.artifacts.folders pref).
- A claude.ai page keeps a copy viewable without the publishing account: its
  HTML file (and supporting files) snapshotted at publish, or the copy Claude
  saves for a Doc / Slides / Design in artifacts-export/ (a synchronous
  PostToolUse hint hook, scripts/artifact-export-hint.js, admin switch),
  attached to the page at Stop. Viewed in HtmlFrame's sandbox, Markdown, or
  pdf.js (pdfjs-dist 6.4.299, legacy build, loaded only for a PDF).

Fixes:
- tmux: a cached /proc/<pid>/exe of an exited server falls back to PATH's
  tmux (stop the last pane, start again within 10 s failed with ENOENT).
- shelves: a shelf restores beside changes in other files.
- chat: a finished reply ends the turn even with no hook at all.
- Settings → AI tools: profile list display tweaks.

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

@@ -0,0 +1,58 @@
+/**
+ * @file Tests for PdfView: pdf.js (mocked — jsdom has no canvas) draws one
+ * canvas per page, scripting off, and a PDF that cannot be read says so.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { render, screen, waitFor } from "@testing-library/react";
+import "../../i18n";
+
+const getDocument = vi.fn();
+vi.mock("pdfjs-dist/legacy/build/pdf.mjs", () => ({
+  GlobalWorkerOptions: { workerSrc: "" },
+  getDocument: (...a: unknown[]) => getDocument(...a),
+}));
+
+import { PdfView } from "../PdfView";
+
+const realFetch = globalThis.fetch;
+beforeEach(() => {
+  getDocument.mockReset();
+  globalThis.fetch = vi.fn(
+    async () => new Response(new Uint8Array([37, 80, 68, 70]))
+  ) as typeof fetch;
+});
+afterEach(() => {
+  globalThis.fetch = realFetch;
+});
+
+describe("PdfView", () => {
+  it("draws every page on its own canvas, with XFA off", async () => {
+    const render1 = vi.fn(() => ({ promise: Promise.resolve() }));
+    getDocument.mockReturnValue({
+      destroy: vi.fn(),
+      promise: Promise.resolve({
+        numPages: 3,
+        getPage: async () => ({
+          getViewport: ({ scale }: { scale: number }) => ({
+            width: 600 * scale,
+            height: 800 * scale,
+          }),
+          render: render1,
+        }),
+      }),
+    });
+    const { container } = render(<PdfView url="/api/artifacts/1/raw?path=a.pdf" title="a.pdf" />);
+    await waitFor(() => expect(container.querySelectorAll("canvas")).toHaveLength(3));
+    expect(render1).toHaveBeenCalledTimes(3);
+    expect(getDocument.mock.calls[0]![0]).toMatchObject({ enableXfa: false });
+    expect(screen.getByLabelText("Page 2")).toBeInTheDocument();
+  });
+
+  it("says so when the file cannot be read", async () => {
+    getDocument.mockReturnValue({ destroy: vi.fn(), promise: Promise.reject(new Error("bad")) });
+    render(<PdfView url="/x" title="x.pdf" />);
+    expect(await screen.findByText(/could not be shown/)).toBeInTheDocument();
+  });
+});