opentui(phase3): launcher integration — HERMES_TUI_ENGINE dual-engine

hermes --tui launches the native OpenTUI engine (Bun) when
HERMES_TUI_ENGINE=opentui (env) or display.tui_engine=opentui (config);
Ink stays the default and the shipping path is untouched.

- _resolve_tui_engine() (env > config > ink); refuses opentui on
  Windows/Termux (no Bun) -> falls back to ink with a notice.
- _make_opentui_argv() -> [bun, src/entry.real.tsx] (no build step).
- _bun_bin() with HERMES_BUN override.
- Branch at top of _make_tui_argv BEFORE _ensure_tui_node (Bun-only host
  must not bootstrap Node).
- Gate _launch_tui NODE_OPTIONS/--max-old-space-size on engine==ink (Bun
  is JSC; the V8 flag errors/ignores).

Verified end-to-end via tmux: real hermes --tui -> Bun -> OpenTUI ->
real Python gateway streamed a real reply. No-flag default still ink.

website/static/api/model-catalog.json

@@ -1,6 +1,6 @@
 {
   "version": 1,
-  "updated_at": "2026-06-09T17:20:16Z",
+  "updated_at": "2026-06-04T23:57:51Z",
   "metadata": {
     "source": "hermes-agent repo",
     "docs": "https://hermes-agent.nousresearch.com/docs/reference/model-catalog"
@@ -12,10 +12,6 @@
         "note": "Descriptions drive picker badges. Live /api/v1/models filters curated ids by tool-calling support and free pricing."
       },
       "models": [
-        {
-          "id": "anthropic/claude-fable-5",
-          "description": ""
-        },
         {
           "id": "anthropic/claude-opus-4.8",
           "description": ""
@@ -120,10 +116,6 @@
           "id": "openrouter/owl-alpha",
           "description": "free"
         },
-        {
-          "id": "poolside/laguna-m.1:free",
-          "description": "free"
-        },
         {
           "id": "tencent/hy3-preview:free",
           "description": "free"
@@ -132,10 +124,6 @@
           "id": "nvidia/nemotron-3-super-120b-a12b:free",
           "description": "free"
         },
-        {
-          "id": "nvidia/nemotron-3-ultra-550b-a55b:free",
-          "description": "free"
-        },
         {
           "id": "inclusionai/ring-2.6-1t:free",
           "description": "free"
@@ -148,9 +136,6 @@
         "note": "Free-tier gating is determined live via Portal pricing (partition_nous_models_by_tier), not this manifest."
       },
       "models": [
-        {
-          "id": "anthropic/claude-fable-5"
-        },
         {
           "id": "anthropic/claude-opus-4.8"
         },