Reorganize changelogs

Author: quantstruct-bot

fern/changelog/2025-06-24.mdx

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+<Card title="Support for 'Inworld' Voice Provider" icon="microphone">
+  You can now use Inworld as a voice provider by selecting [`Inworld`](https://dashboard.vapi.ai/assistants#:~:text=VOICE-,Voice%20Configuration,-Select%20a%20voice) in your configuration. You can also route your InWorld credentials under [Settings > Integrations](https://dashboard.vapi.ai/settings/integrations#:~:text=Save-,Inworld,-For%20using%20voices). Finally, there are new `Call.endedReason` codes to help you better understand why calls ended due to Inworld voice issues.
+
+  <Frame caption="Inworld Voice Configuration">
+    <img src="../static/images/changelog/inworld-voice-configuration.png" />
+  </Frame>
+</Card>
+
+2. **HMAC Authentication for Webhook Credentials**: Secure your webhooks with HMAC authentication by configuring [`Assistant.credentials.authenticationPlan`](https://api.vapi.ai/api#:~:text=Assistant,-AssistantPaginatedResponse) with [`HMACAuthenticationPlan`](https://api.vapi.ai/api#:~:text=HMACAuthenticationPlan), providing an alternative to OAuth2.
+
+3. **Detailed Call End Reasons for Inworld Voice**: New `endedReason` codes provide more insight when calls end due to Inworld voice issues.
+
+
+<Warning>
+**Breaking Change**: The `codeSwitchingEnabled` property has been removed from Deepgram transcribers. If you're currently using this property in your Deepgram transcriber configurations, you'll need to remove it to avoid errors.
+</Warning>
+
+<Warning>
+  **Deprecation Notice**: The `concurrencyLimit` setting in organization configurations is now deprecated.
+</Warning>