Preserve native exit codes in the release wrapper

docs/release.md

@@ -64,7 +64,9 @@ on success. Exit status 0 means publication is confirmed; status 1 means a
 known failure or conflict; status 2 means invalid input or profile; status 3
 means the push outcome remains unknown and requires resolution.
 
-The CLI runs from the source tree being published, so this command also works
+The wrapper builds the native CLI into ignored `.releasekit/bin`, then invokes
+it directly to preserve its exit status. The CLI comes from the source tree
+being published, so this command also works
 for ReleaseKit's first release before any released ReleaseKit executable
 exists. It uses the local Go toolchain. Preparation must finish before the
 offline validation begins.