Add description, keywords, license, and repository

package.json

@@ -1,10 +1,28 @@
 {
   "name": "sandlot",
   "version": "0.0.1",
+  "description": "Branch-based development with git worktrees and Apple Container",
   "type": "module",
   "bin": {
     "sandlot": "./src/cli.ts"
   },
+  "files": [
+    "src",
+    "completions"
+  ],
+  "keywords": [
+    "git",
+    "worktree",
+    "container",
+    "apple-container",
+    "claude",
+    "cli"
+  ],
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/nichochar/sandlot.git"
+  },
   "dependencies": {
     "commander": "^14.0.3"
   },