feat: bootstrap secure cross-platform assistant

Establish the Electron foundation and pluggable agent runtime so desktop workflows can evolve safely across supported platforms.

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

tsconfig.node.json

@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "target": "ES2022",
+    "lib": ["ES2022"],
+    "types": ["node", "electron-vite/node"],
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "skipLibCheck": true
+  },
+  "include": [
+    "electron.vite.config.ts",
+    "vitest.config.ts",
+    "src/main/**/*.ts",
+    "src/preload/**/*.ts",
+    "src/shared/**/*.ts",
+    "tests/**/*.ts"
+  ]
+}