Add changelog for 2025-07-17 (#578)

Author: quantstruct-bot

fern/changelog/2025-07-17.mdx

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+# Use Transient Tools in Conversation Nodes
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+1. **Add Transient Tools to Conversation Nodes with `tools`:** You can now define transient tools directly within a [`Conversation Node`](https://api.vapi.ai/api#:~:text=ConversationNode) using `Call.workflow.nodes[type=conversation].tools`. This allows for the customization of tools specific to a conversation without altering global tool configurations.
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+2. **Incorporate Existing Tools into Conversation Nodes with `toolIds`:** You can now reference existing tools in a [`Conversation Node`](https://api.vapi.ai/api#:~:text=ConversationNode) by listing their IDs using the `toolIds` property. This enables the reuse of predefined tools across different nodes and workflows for consistency and easier maintenance.
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+This allows you to mix transient, node-specific tools with existing tools within a `ConversationNode`. Learn more about how to use this in the [Conversation Node documentation](https://docs.vapi.ai/workflows/overview#conversation-node).