revise cran comments file (#88)

Author: SpatLyu

cran-comments.md

@@ -1,3 +1,20 @@
 ## R CMD check results
 
 0 errors | 0 warnings | 0 note
+
+## This submission
+
+This update addresses the recent check issue reported by CRAN
+(<https://cran.r-project.org/web/checks/check_results_gdverse.html>).
+
+The reported errors were caused by missing Python modules (e.g., pandas)
+in some CRAN test environments.
+
+To prevent such errors, all Python-dependent examples and functions are now
+wrapped in `tryCatch()` blocks, printing an informative message via
+`message()` when Python or required modules are unavailable.
+
+This ensures that CRAN checks will not fail even if Python is not installed,
+while maintaining full functionality when Python is available.
+
+No other functionality or user-facing behavior has changed.