[skip ci] Add .Rproj, fix hex sticker bat sizing

The CSV from echoverseTemplate has tiny bsize values producing
invisible bats. Generate fresh data with set.seed(1234) instead,
matching how the other echoverse hex stickers were originally created.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bschilder

echoAI.Rproj

@@ -0,0 +1,18 @@
+Version: 1.0
+
+RestoreWorkspace: Default
+SaveWorkspace: Default
+AlwaysSaveHistory: Default
+
+EnableCodeIndexing: Yes
+UseSpacesForTab: Yes
+NumSpacesForTab: 4
+Encoding: UTF-8
+
+RnwWeave: Sweave
+LaTeX: pdfLaTeX
+
+BuildType: Package
+PackageUseDevtools: Yes
+PackageInstallArgs: --no-multiarch --with-keep.source
+PackageCheckArgs: --as-cran

inst/hex/hex.png

@@ -65,7 +65,7 @@ download.file(URL, tmp)
 
 Create background with `ggplot2`.
 
-```{r, eval=FALSE}
+```{r}
 set.seed(1234)
 n_bats <- 20
 d <- data.frame(x = -rexp(n_bats, rate = 3),
@@ -74,13 +74,6 @@ d <- data.frame(x = -rexp(n_bats, rate = 3),
   dplyr::mutate(image = URL,
                 bsize = abs(x*y^2)) |>
   dplyr::arrange(dplyr::desc(x), dplyr::desc(y))
-qplot(d$x, d$y, size=d$bsize)
-```
-
-Import data points for reproducibility.
-
-```{r}
-d <- data.table::fread("https://github.com/RajLabMSSM/echoverseTemplate/releases/download/latest/echoverse_points.csv.gz")
 ```