chore: v2.8.13 — Artifacts reinstall/edit/installs, agent steps in chat, pick a local file to attach, Windows paths as links

- Chat: an Agent step shows its task, status and tool calls and opens its conversation in place; Windows paths (E:\…, C:/…) in replies open as files
- Prompt: attach a file on this computer by path (native picker), clearer too-large messages
- Artifacts: edit title/description and a skill's files (new snapshot), Reinstall, install history, Hub-only rows, skills installed into ~/.claude/skills and ~/.agents/skills
- Files: batch upload of small files in one extract
- AI Tools: npm install falls back to --prefix ~/.local when the global prefix is not writable

server/__tests__/ai-tool-jobs.test.js

@@ -181,6 +181,58 @@ describe("stepsFor", () => {
   });
 });
 
+describe("a system-wide npm prefix", () => {
+  const ro = path.join(root, "ro-prefix");
+  const user = path.join(root, "user-local");
+  const asRoot = process.getuid?.() === 0;
+
+  before(() => {
+    for (const d of [path.join(ro, "lib", "node_modules"), path.join(ro, "bin")]) {
+      fs.mkdirSync(d, { recursive: true });
+      fs.chmodSync(d, 0o555);
+    }
+    versions.__setUserPrefix(user);
+  });
+  after(() => {
+    versions.__setUserPrefix(undefined);
+    for (const d of [path.join(ro, "lib", "node_modules"), path.join(ro, "bin")]) {
+      fs.chmodSync(d, 0o755);
+    }
+  });
+
+  it("installs into the account's ~/.local when npm's global prefix is not writable", async (t) => {
+    if (asRoot) return t.skip("root writes anywhere");
+    versions.__setExec(async (_f, args) => {
+      if (args[0] === "prefix") return { stdout: `${ro}\n` };
+      throw new Error("unexpected");
+    });
+    assert.deepEqual(await jobs.stepsFor("fresh", "install"), [
+      {
+        argv: [path.join(shellBin, "npm"), "install", "-g", "--prefix", user, "fresh-pkg@latest"],
+      },
+    ]);
+  });
+
+  it("updates a tool under ~/.local/lib/node_modules with the same --prefix", async () => {
+    const pkg = path.join(user, "lib", "node_modules", "fresh-pkg", "cli.js");
+    exe(pkg);
+    fs.mkdirSync(path.join(user, "bin"), { recursive: true });
+    fs.symlinkSync(pkg, path.join(serverBin, "fresh"));
+    aiTools.refresh();
+    try {
+      assert.equal(await versions.managedBy("fresh"), "user");
+      assert.deepEqual(await jobs.stepsFor("fresh", "update"), [
+        {
+          argv: [path.join(shellBin, "npm"), "install", "-g", "--prefix", user, "fresh-pkg@latest"],
+        },
+      ]);
+    } finally {
+      fs.rmSync(path.join(serverBin, "fresh"));
+      aiTools.refresh();
+    }
+  });
+});
+
 describe("versions", () => {
   it("marks npm-managed by realpath and badges a newer version", async () => {
     const v = await versions.versions({ fresh: true });