Panel drag no longer misfires on SWELL's always-zero wParam; stable/beta VST editors register distinct window classes against their own module instead of colliding on REAPER's; own-module basename matching moves to a tested pure helper.
Re-checks the physical button before resuming an internal drag and treats a button-up move mid-drag as a release, closing a stale-payload/silent-drop bug; splits the OS hand-off seam into its own TU for the line ceiling; corrects two docs and skips a redundant module-path lookup.
daniel