Import %||% from rlang so cd runs on R 4.1-4.3

Base R exports %||% only from 4.4.0, and DESCRIPTION allows R 4.1, so
cd_cache_fetch() and cd_stac_catalog() failed on R 4.1-4.3 with
"could not find function". The test checks the import table: on R >= 4.4
rlang's %||% is base's, so a function comparison cannot see a missing import.

Fixes #130

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GignjoKpZADXywTf6pAMgj

Author: NewGraphEnvironment

NAMESPACE

@@ -25,5 +25,6 @@ export(cd_stac_catalog)
 export(cd_summary)
 export(cd_trend)
 export(cd_variables)
+importFrom(rlang,"%||%")
 importFrom(rlang,.data)
 importFrom(rlang,.env)

R/cd-package.R

@@ -1,3 +1,3 @@
 #' @keywords internal
-#' @importFrom rlang .data .env
+#' @importFrom rlang .data .env %||%
 "_PACKAGE"

tests/testthat/test-cd-package.R

@@ -0,0 +1,7 @@
+test_that("%||% comes from rlang, so cd runs on R < 4.4 (#130)", {
+  # Base R exports %||% only from 4.4.0 and DESCRIPTION allows 4.1, so on a
+  # newer R a missing import goes unnoticed: base's copy answers instead.
+  # One list entry per importFrom() line, all named "rlang", so read them all.
+  imports <- getNamespaceImports("cd")
+  expect_true("%||%" %in% unlist(imports[names(imports) == "rlang"]))
+})