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.

package.json

@@ -9,11 +9,13 @@
     "packages/*"
   ],
   "scripts": {
+    "pretest": "npm run build:cli",
     "test": "node --experimental-test-module-mocks --test tests/*.test.mjs",
     "typecheck": "tsc --noEmit && tsc --noEmit -p app/tsconfig.json",
     "lint": "eslint .",
     "build:core": "npm run build --workspace @obelisk/core",
-    "build:skill": "rm -rf dist/obelisk-skill && tsc -p tsconfig.skill.json && cp packages/core/src/schema.sql dist/obelisk-skill/scripts/ && cp SKILL.md dist/obelisk-skill/ && cp -R references dist/obelisk-skill/references && cp packaging/skill-package.json dist/obelisk-skill/package.json",
+    "build:cli": "npm run build --workspace @obelisk-apps/cli",
+    "build:skill": "node packaging/build-skill.mjs",
     "publish:skill": "npm run build:skill && packaging/publish-skill.sh"
   },
   "devDependencies": {