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.

ui-tui/package.json

@@ -7,7 +7,7 @@
     "dev": "npm run build --prefix packages/hermes-ink && tsx --watch src/entry.tsx",
     "start": "tsx src/entry.tsx",
     "build": "node scripts/build.mjs",
-    "typecheck": "tsc --noEmit -p tsconfig.json",
+    "type-check": "tsc --noEmit -p tsconfig.json",
     "lint": "eslint src/ packages/",
     "lint:fix": "eslint src/ packages/ --fix",
     "fmt": "prettier --write 'src/**/*.{ts,tsx}' 'packages/**/*.{ts,tsx}'",
@@ -22,12 +22,11 @@
     "ink-text-input": "^6.0.0",
     "nanostores": "^1.2.0",
     "react": "^19.2.4",
-    "undici": "^6.25.0",
     "unicode-animations": "^1.0.3"
   },
   "devDependencies": {
     "@eslint/js": "^9",
-    "@types/node": "^24.13.2",
+    "@types/node": "^25.5.0",
     "@types/react": "^19.2.14",
     "@typescript-eslint/eslint-plugin": "^8",
     "@typescript-eslint/parser": "^8",
@@ -35,12 +34,13 @@
     "eslint": "^9",
     "eslint-plugin-perfectionist": "^5",
     "eslint-plugin-react": "^7",
+    "eslint-plugin-react-compiler": "^19.1.0-rc.2",
     "eslint-plugin-react-hooks": "^7",
     "eslint-plugin-unused-imports": "^4",
     "globals": "^16",
     "prettier": "^3",
     "tsx": "^4.19.0",
-    "typescript": "^6.0.3",
+    "typescript": "^5.7.0",
     "vitest": "^4.1.3"
   }
 }