openai/gpt-chat-latest → A (4:1)

Commit A introduces a functional behavior change by excluding pinned/stickied Reddit posts during subreddit import, adds a dedicated helper, updates documentation, and includes a regression test covering both relevant Reddit fields (`stickied` and `pinned`). This is a meaningful correctness improvement that affects imported data. Commit B is primarily a cleanup/refactoring change that removes dead code made redundant by earlier validation, updates expectations in a test, and preserves existing behavior through lower-level edge handling. While valuable for code simplicity, its impact is smaller than the new functionality and regression protection added in A.