feat(cli): extract Obelisk runtime into npm package

Add @obelisk-apps/cli with the existing build, search, query, and attune contract plus official skill installation.

Separate the docs-only skill artifact, bootstrap installer, release layout, cross-platform CI, and package-level regression coverage.

packages/cli/tsconfig.build.json

@@ -0,0 +1,17 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "noEmit": false,
+    "outDir": "dist",
+    "rootDir": "..",
+    "declaration": false,
+    "rewriteRelativeImportExtensions": true
+  },
+  "include": [
+    "src/**/*.ts",
+    "../core/src/**/*.ts"
+  ],
+  "exclude": [
+    "../core/src/runtime.ts"
+  ]
+}