openai/gpt-chat-latest → B (3:2)

Side B fixes concrete functional issues: Reddit child imports now attach posts directly under the subreddit via a new `apply_entity_under_parent` path that avoids incorrect `ensure_path` behavior, and the ranking panel now shows imported entity titles instead of raw IDs for unranked children. It also updates integration tests to verify the import flow and SSE/UI behavior, whereas Side A mainly adds a developer-only offline compiler/linter tool without changing core runtime behavior.