feat(FN-968): initialize @fusion/tui workspace package

- Add @fusion/tui as a new private workspace package with ink and React dependencies
- Configure TypeScript with JSX (react-jsx), strict mode, and Node16 module resolution
- Add minimal src/index.tsx entry point with package exports
- Update root README.md with tui package reference
- Add pnpm-lock.yaml entries for ink, ink-text-input, and @types/react

packages/tui/README.md

@@ -0,0 +1,7 @@
+# @fusion/tui
+
+Terminal UI components for kb, built with [Ink](https://github.com/vadimdemedes/ink) (React for the command line).
+
+## Status
+
+This package is under active development and not yet published.

packages/tui/package.json

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+{
+  "name": "@fusion/tui",
+  "version": "0.1.0",
+  "type": "module",
+  "exports": {
+    ".": {
+      "types": "./src/index.tsx",
+      "import": "./dist/index.js"
+    }
+  },
+  "files": [
+    "dist",
+    "README.md"
+  ],
+  "scripts": {
+    "build": "tsc",
+    "typecheck": "tsc --noEmit",
+    "test": "echo 'No tests yet' && exit 0"
+  },
+  "dependencies": {
+    "@fusion/core": "workspace:*",
+    "ink": "^6.8.0",
+    "ink-text-input": "^6.0.0",
+    "react": "^19.0.0"
+  },
+  "devDependencies": {
+    "@types/node": "^25.5.0",
+    "@types/react": "^19.0.0",
+    "typescript": "^5.7.0"
+  },
+  "engines": {
+    "node": ">=22.5.0"
+  },
+  "private": true
+}

packages/tui/src/index.tsx

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+/** @fusion/tui — Terminal UI components for kb */
+
+export {};

packages/tui/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "rootDir": "src",
+    "jsx": "react-jsx",
+    "types": ["node"]
+  },
+  "include": ["src/**/*"],
+  "exclude": ["src/**/*.test.ts", "src/**/*.test.tsx", "src/**/__tests__/**/*"]
+}