Fix stage_for_s3.bash to match actual release file patterns

- Only expect Linux builds (macOS must be built locally)
- Fix file pattern: node-*-linux-x64-LATEST.tar.xz (no -pc- in source)
- Only expect 2 tarballs to be processed (linux-x64, linux-arm64)

Co-Authored-By: Claude (global.anthropic.claude-opus-4-5-20251101-v1:0) <noreply@anthropic.com>

Author: JackStrohm-asana

stage_for_s3.bash

@@ -2,18 +2,15 @@
 set -euo pipefail
 
 # Expected files that must be present after downloads
+# Note: Only Linux builds come from CI releases; macOS must be built locally
 EXPECTED_NODE_TARBALLS=(
-  "node-*-linux-x64-pc-LATEST.tar.xz"
-  "node-*-linux-arm64-pc-LATEST.tar.xz"
-  "node-*-darwin-x64-pc-LATEST.tar.xz"
-  "node-*-darwin-arm64-pc-LATEST.tar.xz"
+  "node-*-linux-x64-LATEST.tar.xz"
+  "node-*-linux-arm64-LATEST.tar.xz"
 )
 
 EXPECTED_FIBERS_BINARIES=(
   "linux-x64-*.tar.gz"
   "linux-arm64-*.tar.gz"
-  "darwin-x64-*.tar.gz"
-  "darwin-arm64-*.tar.gz"
 )
 
 check_files_exist() {
@@ -122,8 +119,8 @@ for file in *.tar.xz; do
   fi
 done
 
-if [[ $processed_count -lt 4 ]]; then
-  echo "ERROR: Expected to process at least 4 Node.js tarballs, but only processed $processed_count" >&2
+if [[ $processed_count -lt 2 ]]; then
+  echo "ERROR: Expected to process at least 2 Node.js tarballs, but only processed $processed_count" >&2
   exit 1
 fi