feat(codemode): add confined execution package (#35118)

Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>

packages/codemode/package.json

@@ -0,0 +1,26 @@
+{
+  "$schema": "https://json.schemastore.org/package.json",
+  "name": "@opencode-ai/codemode",
+  "version": "0.0.1",
+  "description": "Effect-native confined code execution over schema-described tools",
+  "private": true,
+  "type": "module",
+  "license": "MIT",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "typecheck": "tsgo --noEmit",
+    "test": "bun test"
+  },
+  "dependencies": {
+    "acorn": "8.15.0",
+    "effect": "catalog:",
+    "typescript": "catalog:"
+  },
+  "devDependencies": {
+    "@tsconfig/bun": "catalog:",
+    "@types/bun": "catalog:",
+    "@typescript/native-preview": "catalog:"
+  }
+}