feat(HAI-108): remove binary builds and configure npm publishing

- Remove binary build steps from CI and delete release/test-release workflows
- Replace release workflow with npm publish via version.yml and changesets
- Configure all packages (cli, core, dashboard, engine) for npm publishing
- Add package-config tests to verify publishConfig and package metadata
- Update README and documentation to reflect npm-based distribution

packages/cli/package.json

@@ -5,6 +5,10 @@
   "bin": {
     "hai": "./dist/bin.js"
   },
+  "files": [
+    "dist",
+    "README.md"
+  ],
   "scripts": {
     "dev": "tsx src/bin.ts",
     "build": "tsc",