[macos-runner] Fix build number bump - agvtool was silently no-oping

Upload rejected with "bundle version must be higher than previously
uploaded version: 1" - agvtool new-version requires VERSIONING_SYSTEM =
apple-generic, which this project never sets, so it did nothing every
run despite reporting success. Pass CURRENT_PROJECT_VERSION directly
via xcargs instead, parameterized from the job's run number.

Darwin/fastlane/Fastfile

@@ -17,12 +17,17 @@ lane :assemble do |options|
   # scope a global override to just one target, and update_code_signing_settings
   # itself can't parse this project's newer .pbxproj format anyway (gem
   # limitation, not fixable by updating the gem).
+  # agvtool needs VERSIONING_SYSTEM = apple-generic, which this project doesn't
+  # set, so it silently no-ops - pass CURRENT_PROJECT_VERSION directly instead.
+  xcargs = "-skipPackagePluginValidation -skipMacroValidation"
+  xcargs += " CURRENT_PROJECT_VERSION=#{ENV['BUILD_NUMBER']}" if ENV["BUILD_NUMBER"]
+
   build_app(
     scheme: "PediFoods App",
     sdk: "iphoneos",
     export_method: ENV["BITRISE_DISTRIBUTION_METHOD"] || "app-store",
     xcconfig: "fastlane/AppStore.xcconfig",
-    xcargs: "-skipPackagePluginValidation -skipMacroValidation",
+    xcargs: xcargs,
     derived_data_path: "../.build/Darwin/DerivedData",
     output_directory: "../.build/fastlane/Darwin",
     skip_archive: ENV["FASTLANE_SKIP_ARCHIVE"] == "YES",