[APP] Gandr

**Name of app / service**

Gandr, a text to speech API for voice agents (https://gandr.ai).

**Link to developer documentation**

https://gandr.ai/docs

**Is lack of support preventing you from moving forward, or do you have a workaround?**

PR #21830 adds the Gandr app file and a first action, and the review note there says the app has to be registered first. The workaround today is a raw HTTP request step against POST https://tts.gandr.ai/v1/audio/speech with a bearer key, which works but hides the voice and format options behind hand-written JSON.

**Are there specific actions or triggers you'd like to see for this app?**

One action to start: Convert Text to Speech (text in, audio out as mp3, wav or pcm; six stock voices; up to 2000 characters per request). No triggers.

Disclosure: I work on Gandr.

Start with PR #21830, which adds the Gandr app file and first action, then read the Gandr developer documentation at https://gandr.ai/docs. Confirm the app is registered and that the Convert Text to Speech action exposes text, mp3/wav/pcm format, six voices, and the 2000-character limit.

Written by the indexing model from the issue text.