📢 Composer actions PSA: deprecating parentHash 

We're removing the parentHash attribute from composer action responses and instead will always use the original cast's parent hash. 

This has been a pain point and source of bugs for some composer actions: if a parent hash is present in the original cast but the action doesn't pass it through, it clobbers the original and appears as a root cast. This is pretty weird behavior and it makes more sense to just preserve the original.

For now we'll just ignore any extra attributes in cast action responses, but will start validating this more strictly a few days from now.

I've updated the draft spec doc and added a changelog at the bottom: https://warpcast.notion.site/Draft-Composer-Actions-7f2b8739ee8447cc8a6b518c234b1eeb
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