debug(ci): add debug logging for version bump, use if/else instead of switch

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Jenkinsfile

@@ -64,11 +64,14 @@ pipeline {
                     def minor = parts[1].toInteger()
                     def patch = parts[2].toInteger()
 
-                    switch (params.VERSION_BUMP) {
-                        case 'major': major++; minor = 0; patch = 0; break
-                        case 'minor': minor++; patch = 0; break
-                        case 'patch': default: patch++; break
-                    }
+                    echo "DEBUG: VERSION_BUMP=[${params.VERSION_BUMP}]"
+                    echo "DEBUG: before bump major=${major} minor=${minor} patch=${patch}"
+
+                    if (params.VERSION_BUMP == 'major') { major++; minor = 0; patch = 0 }
+                    else if (params.VERSION_BUMP == 'minor') { minor++; patch = 0 }
+                    else { patch++ }
+
+                    echo "DEBUG: after bump major=${major} minor=${minor} patch=${patch}"
                     def newVer = "${major}.${minor}.${patch}"
                     echo "Auto-bumped PUBLISH_VERSION: ${currentVer} → ${newVer}"
                     env.NEW_VERSION = newVer