ReleaseProcessOverview.md Step 4: flag that Regression Test Suite
3's automated coverage is install-only, never sdp_upgrade.sh --
the gap that let SDP-1394/1395 ship in 2026.1 GA. Points to the
install-sdp-test-suite-run skill's new manual upgrade-test
procedure, and recommends running it here (pre-release) rather
than only as part of post-release smoke testing, for any release
touching the package-structure install/upgrade path.