initial cli api, some movement on tool selection

deno.json

@@ -1,12 +1,14 @@
 {
   "name": "@bearmetal/pdf-tools",
   "tasks": {
-    "dev": "deno run -A --watch dev.ts",
+    "dev": "deno run -A --watch main.ts",
     "compile": "deno compile -o compare-form-fields.exe --target x86_64-pc-windows-msvc -R ./main.ts",
     "install": "deno install -fgq --import-map ./deno.json -n checkfields -R ./main.ts"
   },
   "imports": {
     "@std/assert": "jsr:@std/assert@1",
-    "pdf-lib": "npm:pdf-lib@^1.17.1"
-  }
-}
+    "pdf-lib": "npm:pdf-lib@^1.17.1",
+    "util/": "./util/"
+  },
+  "exports": {}
+}