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-manifest.json

@@ -0,0 +1,7 @@
+{
+  "source": "/tmp/codex-asar/webview",
+  "vendoredAt": "2026-10-27T03:31:32.962Z",
+  "fileCount": 20918,
+  "indexHtmlSha256": "85e5c5b4ce1cd7e0fc42ccbac7fe6d9c6ac7b2eb4b8a7f77beb39d280fdca9f5",
+  "verification": "diff -rq clean; identical sha256"
+}