choose default for decompression limit

* #3491 and #3502 use 250Mb limit as default
* this may be too low for some users
* I think the new configs and limit enforcement are useful as security hardening but we may want to default to applying no limit and allow users to opt in

Start by reading issues #3491 and #3502 to understand the new decompression configurations and limit enforcement. Compare the 250MB default with the proposed unlimited-by-default, opt-in behavior, then clarify the decision and its acceptance criteria with maintainers. Done means the chosen default and configuration behavior are agreed and reflected consistently.

Written by the indexing model from the issue text.