Add workflow_streams samples#300

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jssmith wants to merge 8 commits intotemporalio:mainfrom

jssmith:workflow-streams-samples

Commits on Apr 30, 2026

Add workflow_streams samples: order_workflow scenario
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samples: workflow_stream: add reconnecting-subscriber scenario

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samples: workflow_stream: add external-publisher scenario

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samples: workflow_stream: add truncating-ticker scenario

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samples: rename workflow_stream → workflow_streams; migrate to topic handles

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samples: workflow_streams review polish
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workflow_streams: deliver terminal events + fix run_publisher subscribe shape
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workflow_streams README: document the stream-end pattern
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