refactor(cli): use spaces in custom operation keys

Operation keys like 'config get' read naturally and crud.ts normalizes
spaces to dashes for the registry name.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/cli/crud.ts

@@ -279,7 +279,7 @@ export function registerResource(def: ResourceDef): void {
   if (def.customOperations) {
     for (const [verb, op] of Object.entries(def.customOperations)) {
       register({
-        name: `${def.plural}-${verb}`,
+        name: `${def.plural}-${verb.replace(/ /g, '-')}`,
         description: op.description,
         access: op.access,
         resource: def.plural,