fix: bare split without string argument now correctly uses $_ in eval'd code

When `split` was called without an explicit string argument (e.g., bare
`split` or `split /PAT/`), it relied on the runtime fallback to
getGlobalVariable("main::_"). This worked in JVM-compiled code but failed
in bytecode-interpreted code (eval'd strings because the bytecode compiler
compiled the empty argument list in scalar context, producing a spurious
value that was then treated as the string to split.

Fix: In parseSplit(), when no string argument is provided, explicitly add
-A as the default argument in the AST. This is consistent with how other
operators (defined, print, chomp) handle the -A default, and ensures both
JVM and bytecode backends correctly resolve -A at runtime.

This fixes ExifTool Writer test 6 (TimeCodes encoding), Geotag tests
2/4/9/10 (GPX parsing), and Geolocation test 5 (GPS track processing),
all of which used bare  inside eval'd code strings.

ExifTool test results: 113/113 files pass, 600/600 tests pass (100%).

Generated with [Devin](https://cli.devin.ai/docs)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
EOF
)

Author: fglock

src/main/java/org/perlonjava/core/Configuration.java

@@ -33,7 +33,7 @@ public final class Configuration {
      * Automatically populated by Gradle/Maven during build.
      * DO NOT EDIT MANUALLY - this value is replaced at build time.
      */
-    public static final String gitCommitId = "094672225";
+    public static final String gitCommitId = "8a2462e01";
 
     /**
      * Git commit date of the build (ISO format: YYYY-MM-DD).
@@ -48,7 +48,7 @@ public final class Configuration {
      * Parsed by App::perlbrew and other tools via: perl -V | grep "Compiled at"
      * DO NOT EDIT MANUALLY - this value is replaced at build time.
      */
-    public static final String buildTimestamp = "Apr  9 2026 17:10:40";
+    public static final String buildTimestamp = "Apr  9 2026 17:23:07";
 
     // Prevent instantiation
     private Configuration() {

src/main/java/org/perlonjava/frontend/parser/OperatorParser.java

@@ -911,6 +911,13 @@ static BinaryOperatorNode parseSplit(Parser parser, LexerToken token, int curren
                 ((OperatorNode) separator).operator = "quoteRegex";
             }
         }
+        // If no string argument provided, default to $_
+        // This is needed so both JVM and bytecode backends resolve $_ correctly
+        // at runtime (the bytecode backend otherwise compiles the empty ListNode
+        // in scalar context, producing a spurious value instead of $_ fallback)
+        if (operand.elements.isEmpty()) {
+            operand.elements.add(ParserNodeUtils.scalarUnderscore(parser));
+        }
         return new BinaryOperatorNode(token.text, separator, operand, currentIndex);
     }