listification make text

[dglazkov]

• Fix flattenContext to correctly zip the lists.
• Make "Chat with user" work with lists.
• Teach GOAL to sense lists as inputs.
• Relax the StructureResponse a bit to allow two-part responses.
• Teach GOAL parallel strategist to produce lists.
• Plumb makeList to think strategist.
• docs(changeset): Teach listification to "Make Text" and GOAL.

[changeset-bot]

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Latest commit: 6bb8e8b

The changes in this PR will be included in the next version bump.

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Name	Type
@breadboard-ai/a2	Minor

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