docs: add 2025-06-27 changelog

Author: bajajcodes

fern/changelog/2025-06-27.mdx

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+## New Features
+
+### [Inworld voice integration](https://docs.vapi.ai/changelog/2025/6/24)
+
+- Added support for Inworld as a TTS provider.
+
+- Choose from a broad portfolio of Inworld voices (English, Mandarin, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese, Spanish).
+
+- Bring your own Inworld API key, configure caching and fallback behavior via API.
+
+## Improvements
+
+- Added support for [LMNT voice language selection](https://docs.vapi.ai/changelog/2025/6/25), allowing you to specify the language for LMNT TTS voices.
+
+- [Enhanced campaign metrics with new counters](https://docs.vapi.ai/changelog/2025/6/25) for queued, scheduled, in-progress, and voicemail-ended calls.
+
+- Added the ability to include [custom metadata for MCP tools](https://docs.vapi.ai/changelog/2025/6/25), enabling more advanced tool integrations.
+
+- Expanded [customer metadata creation options](https://docs.vapi.ai/changelog/2025/6/26) with support for email and external customer IDs.
+
+- Improved assistant and workflow configuration with [more flexible credential and compliance plan options](https://docs.vapi.ai/changelog/2025/6/20).
+
+- Enhanced [chat and web chat APIs](https://docs.vapi.ai/changelog/2025/6/26) with new session and assistant override capabilities.
+
+## Bug Fixes
+
+- Fixed inconsistent application of [assistant variable substitution](https://docs.vapi.ai/changelog/2025/6/26) in web chat.
+
+- Resolved validation issue for non-E.164 numbers with [customer number formatting checks for non-E164 numbers](https://docs.vapi.ai/changelog/2025/6/26) during batch calls.
+
+- Addressed edge case where [fallback plans for voices could fail to trigger on provider errors](https://docs.vapi.ai/changelog/2025/6/25).
+
+## Behind The Scenes
+
+- Removed the [deprecated Deepgram code switching](https://docs.vapi.ai/changelog/2025/6/24) transcriber option.
+
+- Added API endpoints for [workflow generation](https://docs.vapi.ai/changelog/2025/6/25).
+
+- Introduced new workflow and assistant schemas for Google and custom LLM models via [new workflow and assistant schema definitions for Google and custom LLM models](https://docs.vapi.ai/changelog/2025/6/25).
+
+- Enabled [more granular assistant, workflow, and tool configuration](https://docs.vapi.ai/changelog/2025/6/20).
+
+- Enhanced [MCP tool protocol support](https://docs.vapi.ai/changelog/2025/6/25) with metadata options for streamable HTTP and SSE.
+
+- Expanded authentication with [support for HMAC authentication plans](https://docs.vapi.ai/changelog/2025/6/24).
+
+- Refactored [campaign and customer](https://docs.vapi.ai/changelog/2025/6/26) objects for improved scalability and clarity.
+
+- Expanded [observability and compliance configuration](https://docs.vapi.ai/changelog/2025/6/25) for organizations, assistants, and workflows.