build: move jcstress to opt-in -Pjcstress profile

The jcstress execution was bound to the test phase with
<skip>${skipTests}</skip>. The publish pipeline uses
-Dmaven.test.skip=true (a different Maven property), which correctly
skipped surefire and test compilation but did NOT skip jcstress.
jcstress then crashed with an NPE because the annotation-processor-
generated META-INF/jcstress/TestList resource had never been built.

Move the execution into a <profile id="jcstress"> so it only runs
when explicitly requested via -Pjcstress. The exec-maven-plugin is
kept in the default build for JMH benchmarks.

publish.yml: add -Pjcstress to the Java test job so jcstress still
runs at least once per CI build (in the test phase, not in the
release/package phase that skips tests).

https://claude.ai/code/session_01NHGqtxTLHUXAEzqABvmKnB

Author: claude

.github/workflows/publish.yml

@@ -403,7 +403,7 @@ jobs:
           echo "${{ github.workspace }}/core.%e.%p" | sudo tee /proc/sys/kernel/core_pattern
       - name: Run tests
         run: |
-          mvn --no-transfer-progress test \
+          mvn --no-transfer-progress -P jcstress test \
             -Dnet.ladenthin.llama.nomic.path=models/${NOMIC_EMBED_MODEL_NAME} \
             -Dnet.ladenthin.llama.vision.model=models/${VISION_MODEL_NAME} \
             -Dnet.ladenthin.llama.vision.mmproj=models/${VISION_MMPROJ_NAME} \

pom.xml

@@ -506,26 +506,6 @@ SPDX-License-Identifier: MIT
 					<mainClass>org.openjdk.jmh.Main</mainClass>
 					<classpathScope>test</classpathScope>
 				</configuration>
-				<executions>
-					<execution>
-						<id>jcstress</id>
-						<phase>test</phase>
-						<goals><goal>exec</goal></goals>
-						<configuration>
-							<skip>${skipTests}</skip>
-							<executable>${java.home}/bin/java</executable>
-							<classpathScope>test</classpathScope>
-							<arguments>
-								<argument>-classpath</argument>
-								<classpath/>
-								<argument>org.openjdk.jcstress.Main</argument>
-								<argument>-v</argument>
-								<argument>-m</argument>
-								<argument>default</argument>
-							</arguments>
-						</configuration>
-					</execution>
-				</executions>
 			</plugin>
 		</plugins>
 	</build>
@@ -663,5 +643,35 @@ SPDX-License-Identifier: MIT
 				</plugins>
 			</build>
 		</profile>
+		<profile>
+			<id>jcstress</id>
+			<build>
+				<plugins>
+					<plugin>
+						<groupId>org.codehaus.mojo</groupId>
+						<artifactId>exec-maven-plugin</artifactId>
+						<executions>
+							<execution>
+								<id>jcstress</id>
+								<phase>test</phase>
+								<goals><goal>exec</goal></goals>
+								<configuration>
+									<executable>${java.home}/bin/java</executable>
+									<classpathScope>test</classpathScope>
+									<arguments>
+										<argument>-classpath</argument>
+										<classpath/>
+										<argument>org.openjdk.jcstress.Main</argument>
+										<argument>-v</argument>
+										<argument>-m</argument>
+										<argument>default</argument>
+									</arguments>
+								</configuration>
+							</execution>
+						</executions>
+					</plugin>
+				</plugins>
+			</build>
+		</profile>
 	</profiles>
 </project>