docs: add autolens_assistant prototype callout to README and docs index

Adds a prominent but clearly-flagged-as-prototype pointer to the new
PyAutoLabs/autolens_assistant repo near the top of the PyAutoLens README and
the docs landing page. The callout sits above the existing "Getting Started"
links but explicitly tells users the readthedocs/workspace/HowToLens entries
remain the recommended starting points; the assistant is offered only for
users who'd like to drive PyAutoLens by natural-language conversation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: 2 people

README.md

@@ -23,6 +23,8 @@ When two or more galaxies are aligned perfectly down our line-of-sight, the back
 
 This is called strong gravitational lensing and **PyAutoLens** makes it **simple** to model strong gravitational lenses, using JAX to **accelerate lens modeling on GPUs**.
 
+> 🤖 **Prototype:** [**autolens_assistant**](https://github.com/PyAutoLabs/autolens_assistant) is an early-stage AI assistant you talk to in natural language to do lens modeling end-to-end. It is experimental and **not the recommended starting point** — the readthedocs, autolens_workspace, and HowToLens below remain the canonical entry points. Try it if you'd like to drive PyAutoLens by conversation.
+
 ## Getting Started
 
 The following links are useful for new starters:

docs/index.md

@@ -8,6 +8,10 @@ When two or more galaxies are aligned perfectly down our line-of-sight, the back
 
 This is called strong gravitational lensing and **PyAutoLens** makes it simple to model strong gravitational lenses, using JAX to **accelerate lens modeling on GPUs**.
 
+```{note}
+🤖 **Prototype:** [autolens_assistant](https://github.com/PyAutoLabs/autolens_assistant) is an early-stage AI assistant you talk to in natural language to do lens modeling end-to-end. It is experimental and **not the recommended starting point** — the readthedocs, autolens_workspace, and HowToLens below remain the canonical entry points. Try it if you'd like to drive PyAutoLens by conversation.
+```
+
 # Getting Started
 
 The following links are useful for new starters: