runpod: fix the package settings URLs the publish script prints

The package name is the last path segment of ghcr.io/<owner>/<name>:<tag>.
Stripping only the registry left the owner in the name, so every URL the
script printed after a push 404'd — on the one step the user has to do by
hand, because GitHub has no API for package visibility.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0182DhR1eFNPQyGmDrpHbedY

packaging/runpod/publish_capability_images.sh

@@ -154,7 +154,10 @@ if [[ "$REGISTRY" == "ghcr.io" ]]; then
     say "registry-credential id, so open each of these and set Visibility → Public:"
     say
     for t in "${built[@]}"; do
-        name="${t#*/}"; name="${name%%:*}"
+        # The package name is the LAST path segment: ghcr.io/<owner>/<name>:<tag>.
+        # Stripping only the registry would leave the owner in the name and the
+        # URL would 404.
+        name="${t##*/}"; name="${name%%:*}"
         say "  https://github.com/users/${owner}/packages/container/${name}/settings"
     done
     say