Prepare rumble-client 0.3.0 release

CHANGELOG.md

@@ -6,10 +6,16 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ## [Unreleased]
 
+## [0.3.0] - 2026-10-20
+
 ### Changed
 
 - `submit` no longer posts result issues through the GitHub API and no longer needs a token. It writes each batch of results to a plain text file under `.rumble-client/submissions` (split by size as well as by the limit of sixty results) and prints the result form address; you paste the file into the form, press Create, and run `submit` again later to collect the receipt. Outside contributors could not create a repository-scoped token and the API dropped the submission label, so their issues were never processed.
 
+### Fixed
+
+- Configuration validation no longer prints a stale message claiming battle execution is unavailable.
+
 ## [0.2.0] - 2026-09-15
 
 ### Fixed

gradle.properties

@@ -1,5 +1,5 @@
 group=dev.robocode.rumble
-version=0.3.0-SNAPSHOT
+version=0.3.0
 tankRoyaleRunnerVersion=1.3.1
 org.gradle.configuration-cache=true
 org.gradle.caching=true

src/main/java/dev/robocode/rumble/client/RumbleClient.java

@@ -119,7 +119,6 @@ static void run(final String[] arguments, final PrintStream output, final Runtim
             return;
         }
         output.printf("Configuration %s is valid for %s mode.%n", configurationPath, configuration.mode().displayName());
-        output.println("Battle execution is not available yet.");
     }
 
     private static boolean hasOnlyArgument(final String[] arguments, final String option) {

src/test/java/dev/robocode/rumble/client/RumbleClientTest.java

@@ -1,5 +1,6 @@
 package dev.robocode.rumble.client;
 
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
@@ -46,6 +47,18 @@ void testUnitPositive_printsSuccessfulRuntimePreflight() throws IOException {
         assertTrue(bytes.toString().contains("OK Java (required 25): 25.0.1"));
     }
 
+    @Test
+    @Tag("Unit")
+    void testUnitPositive_validatesConfigurationWithoutStaleExecutionWarning() throws IOException {
+        final Path configurationPath = writePracticeConfiguration();
+        final ByteArrayOutputStream bytes = new ByteArrayOutputStream();
+
+        RumbleClient.run(new String[] {"--validate-config", configurationPath.toString()}, new PrintStream(bytes));
+
+        assertTrue(bytes.toString().contains("is valid for practice mode"));
+        assertFalse(bytes.toString().contains("Battle execution is not available yet."));
+    }
+
     @Test
     @Tag("Unit")
     void testUnitNegative_failsRuntimePreflightWhenAnyRuntimeIsUnavailable() {