Chipmunk 4 Alpha.3

This release is mainly a hot fix for an issue regarding cleaning up sessions temporary files on closing the application while a session is still running

What is new

• Improves app shutdown reliability by stopping open sessions and cleaning up session files.
• Handles repeated or racing session stop requests more safely during shutdown.
• Restores recent sessions from legacy Chipmunk 3 storage into Chipmunk 4 when needed.
• Improves chart documentation and cleans up internal crate/directory naming.