Add changelog for 2025-08-29 (#656)

Author: quantstruct-bot

fern/changelog/2025-08-29.mdx

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+1. **Per-Artifact Storage Routing in [Artifact Plans](https://api.vapi.ai/api#:~:text=ArtifactPlan)**: You can now override artifact storage behavior per assistant/call for SIP packet capture (PCAP), logging, and call recording artifacts:
+
+- `Assistant.artifactPlan.pcapUseCustomStorageEnabled` (default true): Use custom storage for SIP packet capture, which are stored in `Assistant.artifactPlan.pcapUrl`.
+- `Assistant.artifactPlan.loggingUseCustomStorageEnabled` (default true): Determines whether to use your custom storage (S3 or GCP) for call logs when storage credentials are configured; set to false to store logs on Vapi's storage for this assistant, even if custom storage is set globally.
+- `Assistant.artifactPlan.recordingUseCustomStorageEnabled` (default true): Determines whether to use your custom storage (S3 or GCP) for call recordings when storage credentials are configured; set to false to store recordings on Vapi's storage for this assistant, even if custom storage is set globally.