v6.4.0-beta.15

Features

• Core: Add framework field support to main.js (#16393)

Bug Fixes

• Addon-docs: Spread all the old docs context fields (#16399)
• Core: Reverse checking of promise so it's OK if we get it wrong (#16396)

Maintenance

• Addon-interactions: Update interaction hover icon (#16388)
• Core: Refactor story store to be simpler when getting the index (#16397)