feat: bootstrap workspace with CI, typecheck, and import guardrails

tsconfig.types.json

@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "emitDeclarationOnly": true,
+    "declaration": true,
+    "outDir": "dist/types"
+  },
+  "include": ["packages/**/src/*.js"]
+}