Describe Lets-Plot in the site intro and project docs

Author: tdhopper

CLAUDE.md

@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-pythonplot.com is a static website that provides a visual comparison of different Python plotting libraries (pandas, matplotlib, seaborn, plotnine, plotly, altair) and R's ggplot2 for exploratory data analysis. It serves as a "Rosetta Stone" showing how to create the same plots across different libraries.
+pythonplot.com is a static website that provides a visual comparison of different Python plotting libraries (pandas, matplotlib, seaborn, plotnine, lets-plot, plotly, altair) and R's ggplot2 for exploratory data analysis. It serves as a "Rosetta Stone" showing how to create the same plots across different libraries.
 
 ## Architecture
 
@@ -115,7 +115,7 @@ All plots are rendered to static PNG images inside the executed notebook:
 
 ## Dependencies
 
-Python dependencies are declared in `pyproject.toml` and locked in `uv.lock` (committed). Key libraries: pandas, matplotlib, seaborn, plotnine, plotly (+kaleido), altair (+vl-convert-python), statsmodels, rpy2, Jinja2 with jinja2-highlight.
+Python dependencies are declared in `pyproject.toml` and locked in `uv.lock` (committed). Key libraries: pandas, matplotlib, seaborn, plotnine, lets-plot, plotly (+kaleido), altair (+vl-convert-python), statsmodels, rpy2, Jinja2 with jinja2-highlight.
 
 R (system install) with ggplot2 and mgcv, installed by `setup_r.sh`.
 

INTRO.md

@@ -29,6 +29,8 @@ There are several tools that can make the kinds of plots described here. At pres
 
 "[plotly](https://plot.ly/ "Plotly - Make charts and dashboards online")'s Python graphing library makes interactive, publication-quality graphs online. Examples of how to make line plots, scatter plots, area charts, bar charts, error bars, box plots, histograms, heatmaps, subplots, multiple-axes, polar charts, and bubble charts." I provide plotly examples rendered as static images.
 
+"[Lets-Plot](https://lets-plot.org/ "Lets-Plot: an open-source plotting library for statistical data") is an open-source plotting library for statistical data," written by JetBrains and modeled on the grammar of graphics. Its Python API tracks ggplot2 closely enough that most of the examples below translate line for line. I provide Lets-Plot examples rendered as static images.
+
 "[Bokeh](http://bokeh.pydata.org/en/latest/ "Python interactive visualization library") is a Python interactive visualization library that targets modern web browsers for presentation."
 
 "[bqplot](https://github.com/bloomberg/bqplot) is a Grammar of Graphics-based interactive plotting framework for the Jupyter notebook."