This PR completely subsumes https://github.com/zed-industries/zed/pull/46720 <img width="574" height="496" alt="image" src="https://github.com/user-attachments/assets/14ee9185-0be6-49cf-b5fd-114e61915341" /> Release Notes: - Added Python Environments to REPL kernel selection - List active toolchain/python environment as the recommended kernel for REPL usage --------- Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>