fix(generators): declare @turbo/gen + @repo/core-eslint as dependencies

Adds turbo/generators to pnpm-workspace.yaml and declares its actual
dependencies so pnpm turbo boundaries reports zero issues.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

turbo/generators/package.json

@@ -6,7 +6,11 @@
   "scripts": {
     "test": "vitest run"
   },
+  "dependencies": {
+    "@turbo/gen": "^2.4.0"
+  },
   "devDependencies": {
+    "@repo/core-eslint": "workspace:*",
     "vitest": "^3.1.0"
   }
 }