refactor(core): move shared runtime into workspace package

package-lock.json

@@ -8,6 +8,9 @@
       "name": "obelisk",
       "version": "0.1.0",
       "license": "AGPL-3.0",
+      "workspaces": [
+        "packages/*"
+      ],
       "devDependencies": {
         "@eslint/js": "^10.0.1",
         "@types/node": "^26.1.1",
@@ -211,6 +214,10 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@obelisk/core": {
+      "resolved": "packages/core",
+      "link": true
+    },
     "node_modules/@types/esrecurse": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/@types/esrecurse/-/esrecurse-4.3.1.tgz",
@@ -1275,6 +1282,10 @@
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
+    },
+    "packages/core": {
+      "name": "@obelisk/core",
+      "version": "0.1.0"
     }
   }
 }