Basou v0.70.0

What's Changed

• basou: Have the event readers check the session entry themselves, and refuse it with a typed error by @takashi-matsuyama in #356
• basou: Refuse a session's events.jsonl or session.yaml that is not a regular file, instead of following it by @takashi-matsuyama in #357
• basou: Release v0.70.0 (readers check a session's entry, and refuse an events.jsonl or session.yaml that is not a regular file) by @takashi-matsuyama in #358

Full Changelog: v0.69.0...v0.70.0