core: don't build decompression reader unless we intend to use it
core: don't build decompression reader unless we intend to use it: a task in repo2rlenv-pr-diff (Harbor dataset). Title: core: don't build decompression reader unless we intend to use it
The task
**Title:** core: don't build decompression reader unless we intend to use it
Part of FineEnvs/repo2rlenv-pr-diff.