Auto-detect Windows and fall back to data.table sorting (fixes echolocatoR#134, #146)

sort_coordinates_bash uses Unix grep/sort which are unavailable on
Windows. Now defaults to sort_coordinates="data.table" when
.Platform$OS.type == "windows".

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

Author: bschilder

R/convert.R

@@ -48,9 +48,11 @@ convert <- function(target_path,
                     end_col = start_col,
                     comment_char = NULL,
                     format = NULL,
-                    convert_methods = list(sort_coordinates="bash", 
-                                           run_bgzip="Rsamtools",
-                                           index="Rsamtools"),
+                    convert_methods = list(
+                        sort_coordinates = if(.Platform$OS.type == "windows")
+                            "data.table" else "bash",
+                        run_bgzip = "Rsamtools",
+                        index = "Rsamtools"),
                     conda_env = "echoR_mini",
                     force_new = TRUE,
                     verbose = TRUE) {