Add type field to DEFAULT_STANDUP in createStandup

[dotcomaki]

The type field being removed is the culprit for standups not being created by the automation created. Not sure how it was removed, but it should fix it.

[augmentcode]

🤖 Augment PR Summary

Summary: Restores the missing type field in the default Standup & Prosper standup-creation payload so automated standup creation works again.

Change: Adds type: "SLACK" to DEFAULT_STANDUP in src/activities/tasks/createStandup.ts to meet the API’s expected request shape.

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[augmentcode]

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[oohwooh]

@tylermenezes was there a reason this was removed in 4763f35?

[tylermenezes]

There were a bunch of fields that weren't in the documentation or with wrong formatting. I cleaned everything up to match the documentation including removing that field, and I was pretty sure it worked at the time...