Bump to 2.7.2.9000 dev version after CRAN acceptance

v2.7.2 accepted to CRAN 2026-04-29 by Konstanze Lauseker. Move into
v2.8.0 development.

* DESCRIPTION: Version 2.7.2 -> 2.7.2.9000, Date -> 2026-04-29.
* NEWS.md: prepend "v2.8.0 (in development)" heading sketching
  first-class varPro integration as the next theme. v2.7.2 entry
  preserved unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ehrlinger

DESCRIPTION

@@ -1,8 +1,8 @@
 Package: ggRandomForests
 Type: Package
 Title: Visually Exploring Random Forests
-Version: 2.7.2
-Date: 2026-04-27
+Version: 2.7.2.9000
+Date: 2026-04-29
 Authors@R: person("John", "Ehrlinger",
   role = c("aut", "cre"),
   email = "john.ehrlinger@gmail.com")

NEWS.md

@@ -1,5 +1,13 @@
 Package: ggRandomForests
-Version: 2.7.2
+Version: 2.7.2.9000
+
+ggRandomForests v2.8.0 (in development)
+=======================================
+* First-class `varPro` integration to restore the variable-selection
+  workflow that disappeared with `randomForestSRC::var.select.rfsrc()`.
+  Planned: `varPro` in `Suggests:` (or `Imports:`), `gg_partialpro.varpro`
+  S3 method, and a dedicated "Variable selection with varPro" vignette.
+  See `Claude/Tasks/ggRandomForests v2.8.0 plan.md` (vault) for details.
 
 ggRandomForests v2.7.2
 =====================