* gptel-kagi.el (gptel--request-data, gptel--parse-buffer,
gptel-make-kagi): Add support for the Kagi summarizer. If there
is a url at point (or at the end of the provided prompt), it is
used as the summarizer input. Otherwise the behavior is
unchanged.
* README (Kagi): Mention summarizer support.
* gptel.el: Mention summarizer support.
* gptel.el: Bump version and update package description.
* gptel-kagi.el (gptel--parse-response, gptel--request-data,
gptel--parse-buffer, gptel-make-kagi): Add new file and support
for the Kagi FastGPT LLM API. Streaming and setting model
parameters (temperature, max tokesn) are not supported by the API.
A Kagi backend can be added with `gptel-make-kagi`.
* README.org: Update with instructions for Kagi.
