feat: enable dynamic truncation for all tool outputs by default (#226)

- Change truncate_all_tool_outputs default from false to true
- Update schema.ts to use .default(true) instead of .optional()
- Update documentation in all README files (EN, KO, JA, ZH-CN)
- Rebuild JSON schema with new default value

This prevents prompts from becoming too long by dynamically truncating
all tool outputs based on context window usage. Users can opt-out by
setting experimental.truncate_all_tool_outputs to false.

Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>

assets/oh-my-opencode.schema.json

@@ -1257,6 +1257,7 @@
           "maximum": 0.95
         },
         "truncate_all_tool_outputs": {
+          "default": true,
           "type": "boolean"
         }
       }