fix(ci): tolerate per-OS globs in release upload

Each matrix job only produces its own-OS archive (unix tar.gz /
windows zip). fail_on_unmatched_files=true made every job fail the
cross-OS glob it can't match. Build/Package steps remain the real
guards. No code change.

Author: Teerapat-Vatpitak

.github/workflows/release.yml

@@ -74,7 +74,11 @@ jobs:
         uses: softprops/action-gh-release@v2
         with:
           tag_name: ${{ github.event.inputs.tag || github.ref_name }}
-          fail_on_unmatched_files: true
+          # Each matrix job only produces its own-OS archive (unix→tar.gz,
+          # windows→zip); the shared globs below intentionally don't all match
+          # per job. The Build/Package steps are the real guards (they fail the
+          # job before this step if no binary was produced).
+          fail_on_unmatched_files: false
           files: |
             mcp-loadtest-*.tar.gz
             mcp-loadtest-*.tar.gz.sha256