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fix: rename step-finish to finish-step for AI SDK v5+#244

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bensabic wants to merge 1 commit intomainfrom
fix/finish-step-event-name
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fix: rename step-finish to finish-step for AI SDK v5+#244
bensabic wants to merge 1 commit intomainfrom
fix/finish-step-event-name

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@bensabic
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Renames the step-finish event check to finish-step in fromFullStream() to match the AI SDK v5+ event name. Updates all corresponding test fixtures and descriptions.

Closes #238

AI SDK v5 renamed the `step-finish` event to `finish-step`, causing
`fromFullStream()` to silently ignore step boundaries and concatenate
multi-step agent output without paragraph separators.

Closes #238
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fromFullStream uses step-finish but AI SDK v5+ emits finish-step

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