feat(schema): generate oh-my-openagent schema alongside legacy schema

Update build script to generate both oh-my-opencode.schema.json (backward
compatibility) and oh-my-openagent.schema.json (new package name).
Also adds delegate-task-english-directive hook to schema.

🤖 Generated with assistance of OhMyOpenCode

assets/oh-my-opencode.schema.json

@@ -92,7 +92,8 @@
           "write-existing-file-guard",
           "anthropic-effort",
           "hashline-read-enhancer",
-          "read-image-resizer"
+          "read-image-resizer",
+          "delegate-task-english-directive"
         ]
       }
     },