feat: wire native Codex UI as /console entry, keep classic console at /console-classic

- Vendor codex-ui-stack host/ as cloud/codex-ui-host/ (original/ not vendored, 650MB)
- Bridge emulates 7 methods missing in codex 0.164.0-alpha.9, exposes 29
  experimental-protocol methods (150 -> 179), Linux binary candidates,
  read-only POST /__codex_git
- GET /console 302s to the UI host (:8095) when reachable, else falls back
  to the classic React console; GET /console-classic always serves it
- Alignment tables: docs/codex-native-ui-alignment.md
- Tests: test_console 7, new test_codex_ui_host 4, handler method pin 247 -> 249

cloud/codex-ui-host/host/vendor-original.mjs

@@ -0,0 +1,71 @@
+#!/usr/bin/env node
+/**
+ * Vendor the original webview verbatim into ./original.
+ *
+ * Source: the extracted ChatGPT.app/Contents/Resources/app.asar, i.e.
+ *   <extracted-asar>/webview
+ *
+ * Nothing is rewritten. The copy is byte-for-byte identical, which is what makes
+ * the UI 100% the original rather than an approximation.
+ *
+ * Usage:
+ *   node host/vendor-original.mjs --from /tmp/codex-asar/webview
+ *   node host/vendor-original.mjs --from /path/to/webview --clean
+ */
+import fs from "node:fs";
+import path from "node:path";
+import crypto from "node:crypto";
+import { fileURLToPath } from "node:url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const projectRoot = path.resolve(__dirname, "..");
+
+const args = process.argv.slice(2);
+const getArg = (name, fallback) => {
+  const i = args.indexOf(name);
+  return i >= 0 && args[i + 1] ? args[i + 1] : fallback;
+};
+
+const from = path.resolve(getArg("--from", "/tmp/codex-asar/webview"));
+const to = path.resolve(projectRoot, getArg("--to", "original"));
+const clean = args.includes("--clean");
+
+if (!fs.existsSync(path.join(from, "index.html"))) {
+  console.error(`[vendor] not a webview directory: ${from}`);
+  process.exit(1);
+}
+
+if (clean && fs.existsSync(to)) {
+  console.log(`[vendor] removing ${to}`);
+  fs.rmSync(to, { recursive: true, force: true });
+}
+fs.mkdirSync(to, { recursive: true });
+
+console.log(`[vendor] copying ${from} -> ${to}`);
+fs.cpSync(from, to, { recursive: true, force: true });
+
+// Manifest (written outside ./original so the vendored tree stays untouched).
+function sha256(file) {
+  return crypto.createHash("sha256").update(fs.readFileSync(file)).digest("hex");
+}
+function countFiles(dir) {
+  let n = 0;
+  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+    n += entry.isDirectory() ? countFiles(path.join(dir, entry.name)) : 1;
+  }
+  return n;
+}
+
+const manifest = {
+  source: from,
+  vendoredAt: new Date().toISOString(),
+  fileCount: countFiles(to),
+  indexHtmlSha256: sha256(path.join(to, "index.html")),
+};
+fs.writeFileSync(
+  path.join(projectRoot, "host", "vendor-manifest.json"),
+  JSON.stringify(manifest, null, 2),
+);
+
+console.log(`[vendor] done — ${manifest.fileCount} files`);
+console.log(`[vendor] index.html sha256 ${manifest.indexHtmlSha256}`);