feat(electrobun): auto-updater + E2E tests + splash screen — ALL GAPS CLOSED

Auto-updater:
- updater.ts: GitHub Releases API check, semver comparison, timestamp tracking
- AdvancedSettings wired to real updater.check/getVersion RPC

E2E testing (45 tests):
- wdio.conf.js: WebDriverIO config for Electrobun (port 9761)
- fixtures.ts: isolated temp dirs, demo data, git repo init
- 4 spec files: smoke (13), settings (13), terminal (10), agent (9)

Splash screen:
- SplashScreen.svelte: animated gradient AGOR logo, version, loading dots
- App.svelte: shows splash until all init promises resolve, 300ms fade-out

ui-electrobun/tests/e2e/fixtures.ts

@@ -0,0 +1,105 @@
+/**
+ * E2E test fixture generator for the Electrobun prototype.
+ *
+ * Creates isolated temp directories with demo groups.json, settings.db,
+ * and a scratch git repo. Cleanup happens automatically on test end.
+ */
+
+import { mkdirSync, writeFileSync, rmSync } from "node:fs";
+import { execSync } from "node:child_process";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+import { randomUUID } from "node:crypto";
+
+export interface TestFixture {
+  /** Root temp directory for this test run. */
+  rootDir: string;
+  /** ~/.config/agor equivalent for test isolation. */
+  configDir: string;
+  /** ~/.local/share/agor equivalent for test isolation. */
+  dataDir: string;
+  /** A scratch git repo with an initial commit. */
+  repoDir: string;
+  /** Environment variables to pass to the app process. */
+  env: Record<string, string>;
+  /** Remove all fixture files (best-effort). */
+  cleanup: () => void;
+}
+
+/** Default groups matching the app's seed data. */
+const DEMO_GROUPS = [
+  { id: "dev", name: "Development", icon: "\uD83D\uDD27", position: 0 },
+  { id: "test", name: "Testing", icon: "\uD83E\uddEA", position: 1 },
+  { id: "ops", name: "DevOps", icon: "\uD83D\uDE80", position: 2 },
+  { id: "research", name: "Research", icon: "\uD83D\uDD2C", position: 3 },
+];
+
+/** Demo project config for test assertions. */
+const DEMO_PROJECTS = [
+  {
+    id: "test-project-1",
+    name: "test-project",
+    cwd: "", // filled in with repoDir
+    accent: "var(--ctp-mauve)",
+    provider: "claude",
+    groupId: "dev",
+  },
+];
+
+/**
+ * Create an isolated test fixture with config/data dirs, groups.json,
+ * and a git repo with one commit.
+ */
+export function createTestFixture(prefix = "agor-ebun-e2e"): TestFixture {
+  const rootDir = join(tmpdir(), `${prefix}-${randomUUID().slice(0, 8)}`);
+  const configDir = join(rootDir, "config", "agor");
+  const dataDir = join(rootDir, "data", "agor");
+  const repoDir = join(rootDir, "repo");
+
+  // Create directory tree
+  mkdirSync(configDir, { recursive: true });
+  mkdirSync(dataDir, { recursive: true });
+  mkdirSync(repoDir, { recursive: true });
+
+  // Write demo groups.json
+  writeFileSync(
+    join(configDir, "groups.json"),
+    JSON.stringify({ groups: DEMO_GROUPS }, null, 2),
+  );
+
+  // Update demo project CWD to point at the scratch repo
+  const projects = DEMO_PROJECTS.map((p) => ({ ...p, cwd: repoDir }));
+  writeFileSync(
+    join(configDir, "projects.json"),
+    JSON.stringify(projects, null, 2),
+  );
+
+  // Initialise a scratch git repo with one commit
+  execSync("git init && git commit --allow-empty -m 'init'", {
+    cwd: repoDir,
+    stdio: "ignore",
+    env: {
+      ...process.env,
+      GIT_AUTHOR_NAME: "test",
+      GIT_AUTHOR_EMAIL: "test@test",
+      GIT_COMMITTER_NAME: "test",
+      GIT_COMMITTER_EMAIL: "test@test",
+    },
+  });
+
+  const env: Record<string, string> = {
+    AGOR_TEST: "1",
+    AGOR_TEST_CONFIG_DIR: configDir,
+    AGOR_TEST_DATA_DIR: dataDir,
+  };
+
+  function cleanup() {
+    try {
+      rmSync(rootDir, { recursive: true, force: true });
+    } catch {
+      /* best-effort */
+    }
+  }
+
+  return { rootDir, configDir, dataDir, repoDir, env, cleanup };
+}