Specify response ordering

Currently, this specification requires a client to return a collection of results, for example for the `getLogs` endpoint.

However the order of the results is not specified.

Should the responses be in the order that they were emitted on-chain? Should they be in reverse order? Is any order acceptable? Please specify this.

Start with the specification entry for the getLogs endpoint and review how result collections are currently described. Resolve whether results follow emission order, reverse order, or any order, then make the response-ordering requirement explicit and verify the endpoint documentation reflects it.

Written by the indexing model from the issue text.