promotion: curate BUILD API contract

Author: Sameri11

flutter/defs.bzl

@@ -17,7 +17,6 @@ load(
 )
 load(
     "//tools/flutter:defs.bzl",
-    _dart_aot_elf = "dart_aot_elf",
     _dart_kernel = "dart_kernel",
     _flutter_aot_library = "flutter_aot_library",
     _flutter_app = "flutter_app",
@@ -40,7 +39,6 @@ load(
 # importing names with load() does not re-export them to downstream BUILD files.
 ABIS = _ABIS
 android_native_lib_jar = _android_native_lib_jar
-dart_aot_elf = _dart_aot_elf
 dart_kernel = _dart_kernel
 flutter_android_binary = _flutter_android_binary
 flutter_android_libs = _flutter_android_libs

tests/consumer/BUILD.bazel

@@ -1,14 +1,15 @@
-"""Every public symbol, instantiated the way a consumer would.
+"""The supported BUILD API, with deliberate coverage of macro internals.
 
-This is an API test, not a behaviour test.
+All supported symbols load from @rules_flutter//flutter:defs.bzl. The specialist
+loads below exercise helpers that consumers do not write and are excluded from
+the supported API.
 """
 
 load("@bazel_skylib//rules:build_test.bzl", "build_test")
 load(
     "@rules_flutter//flutter:defs.bzl",
     "ABIS",
     "android_native_lib_jar",
-    "dart_aot_elf",
     "dart_kernel",
     "flutter_android_binary",
     "flutter_android_libs",
@@ -36,6 +37,11 @@ load(
     "NATIVE_LIB",
     "flutter_bundle_contribution",
 )
+
+#
+# These specialist loads are deliberate macro-internal coverage only. Their
+# symbols are not part of the supported Consumer Module API.
+load("@rules_flutter//tools/flutter:defs.bzl", "dart_aot_elf")
 load("@rules_java//java:defs.bzl", "java_import")
 load(":assertions.bzl", "expect_equal", "expect_label_equal")