Add changelog for 2025-07-31

Author: quantstruct-bot

fern/changelog/2025-07-31.mdx

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+1. **Artifact Logging**: You can now access call logs directly through the new `logUrl` property in the [`Artifact`](https://api.vapi.ai/api#:~:text=Artifact) schema, providing a direct URL to call logs for each workflow execution to aid in debugging and compliance.
+
+2. **Azure Speech Transcriber Segmentation**: You can now fine-tune speech segmentation in [`AzureSpeechTranscriber`](https://api.vapi.ai/api#:~:text=AzureSpeechTranscriber) using `segmentationStrategy`, `segmentationMaximumTimeMs`, and `segmentationSilenceTimeoutMs` properties for better transcription control.
+
+<Warning>
+**Breaking Changes**
+
+The following changes may require updates to your existing integrations:
+
+- The `messagePlan` and `backgroundDenoisingEnabled` properties have been removed from [`Assistant`](https://api.vapi.ai/api#:~:text=Assistant), [`AssistantOverrides`](https://api.vapi.ai/api#:~:text=AssistantOverrides), [`CreateAssistantDTO`](https://api.vapi.ai/api#:~:text=CreateAssistantDTO), and [`UpdateAssistantDTO`](https://api.vapi.ai/api#:~:text=UpdateAssistantDTO). Use `backgroundSpeechDenoisingPlan` instead for background denoising configuration.
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+- The `segmentationMaxTimeMs` property in [`AzureSpeechTranscriber`](https://api.vapi.ai/api#:~:text=AzureSpeechTranscriber) has been replaced by `segmentationMaximumTimeMs` for consistency.
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+- The `variables` field in [`Artifact`](https://api.vapi.ai/api#:~:text=Artifact) and [`NodeArtifact`](https://api.vapi.ai/api#:~:text=NodeArtifact) has been replaced by `variableValues` to standardize how extracted data is stored and referenced.
+</Warning>