Add changelog for 2025-08-01.mdx

Author: quantstruct-bot

fern/changelog/2025-08-01.mdx

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+# New Features & Enhancements
+
+1. **Enhanced Call [`Artifacts`](https://api.vapi.ai/api#:~:text=Artifact)**: You can now store detailed information about call workflows and outcomes using [`Artifact`](https://api.vapi.ai/api#:~:text=Artifact) objects. Key properties include:
+    - `nodes`: History of workflow nodes executed during the call.
+    - `messages`: All messages spoken during the call.
+    - `logUrl`: **New!** Direct URL to detailed call logs for debugging.
+    - `pcapUrl`: Packet capture URL for phone calls (provider: `vapi` or `byo-phone-number`).
+    - `recording`: Recording URL (requires `assistant.artifactPlan.recordingEnabled`).
+    - `transcript`: Convenient full call transcript.
+    - `variableValues`: Final workflow variable states.
+    - `messagesOpenAIFormatted`: Spoken messages, formatted for OpenAI.
+
+<Warning>
+    `recordingUrl`, `videoRecordingUrl`, `stereoRecordingUrl`, and `videoRecordingStartDelaySeconds` are now deprecated in favor of the new `recording` and related properties within the `Artifact` object.
+</Warning>
+
+2. **Improved Azure Speech Segmentation Tuning**: You can now fine-tune speech segmentation in your [`Azure Speech Transcriber`](https://api.vapi.ai/api#:~:text=AzureSpeechTranscriber) using `segmentationStrategy`, `segmentationMaximumTimeMs`, and `segmentationSilenceTimeoutMs` properties for better transcription control. This applies to both [`Azure Speech Transcriber`](https://api.vapi.ai/api#:~:text=AzureSpeechTranscriber) and [`Fallback Azure Speech Transcriber`](https://api.vapi.ai/api#:~:text=FallbackAzureSpeechTranscriber).
+
+<Warning>
+    The `segmentationMaxTimeMs` property in [`AzureSpeechTranscriber`](https://api.vapi.ai/api#:~:text=AzureSpeechTranscriber) has been replaced by `segmentationMaximumTimeMs` for consistency.
+</Warning>
+
+## Deprecations
+<CardGroup cols={3}>
+  <Card title="Assistant & Related Objects" icon="cog">
+    <code>messagePlan</code> and <code>backgroundDenoisingEnabled</code> are now part of <code>Assistant.backgroundSpeechDenoisingPlan</code> instead of <code>Assistant</code> and <code>AssistantOverrides</code> directly.
+  </Card>
+  <Card title="Org" icon="building">
+    <code>stripeCustomerId</code> is now part of <code>Subscription</code> instead of <code>Org</code>.
+  </Card>
+  <Card title="AzureSpeechTranscriber" icon="brands microsoft">
+    <code>segmentationMaxTimeMs</code> property has been renamed to <code>segmentationMaximumTimeMs</code> for consistency.
+  </Card>
+</CardGroup>
+