fix(core): Capture Anthropic stream stop_reason from message_delta#21907
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nicohrubec
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The Anthropic streaming instrumentation only read `stop_reason` from `event.message.stop_reason`, but a real stream never populates that — `event.message` appears only on `message_start` (where `stop_reason` is `null`), and the final reason arrives on the `message_delta` event as `delta.stop_reason`. So `finish_reasons` was silently dropped for real streams. Reads it from `message_delta.delta` (the dead `message.stop_reason` path is removed) and re-adds the `finish_reasons` assertions to the streaming tests. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Small bug that was uncovered by moving the integration test suite to real clients: The stop reason was not being recorded correctly during streaming because it was read from the wrong event.