ci: remove dead/no-op -Dmaven.javadoc.skip=true flags (4 occurrences)

The build job's flag (package phase) is removed too: javadoc was verified to build
clean and is now validated by the build + verify jobs. The vmlens/PIT/JMH ones were
dead no-ops (test/test-compile/exec:java never reach the package phase). streambuffer
is Java-8 (<source>8>) so javadoc stays in classpath mode — no skip needed anywhere.

https://claude.ai/code/session_01EQJCrQGmxCBf8WTCDuFE3X

Author: claude

.github/workflows/publish.yml

@@ -57,7 +57,7 @@ jobs:
           distribution: temurin
           cache: maven
       - name: Build
-        run: mvn --batch-mode --no-transfer-progress -DskipTests -Dmaven.javadoc.skip=true package
+        run: mvn --batch-mode --no-transfer-progress -DskipTests package
       - uses: actions/upload-artifact@v7
         with: { name: jars, path: target/*.jar }
 
@@ -94,7 +94,7 @@ jobs:
       - uses: actions/setup-java@v5
         with: { java-version: '21', distribution: temurin, cache: maven }
       - name: Test under vmlens
-        run: mvn --batch-mode --no-transfer-progress -Pvmlens test -Dmaven.javadoc.skip=true
+        run: mvn --batch-mode --no-transfer-progress -Pvmlens test
       - uses: actions/upload-artifact@v7
         if: always()
         with:
@@ -130,7 +130,7 @@ jobs:
           files: target/site/jacoco/jacoco.xml
         continue-on-error: true
       - name: Run PIT mutation tests
-        run: mvn --batch-mode --no-transfer-progress test-compile org.pitest:pitest-maven:mutationCoverage -Dmaven.javadoc.skip=true
+        run: mvn --batch-mode --no-transfer-progress test-compile org.pitest:pitest-maven:mutationCoverage
       - name: Extract PIT survivors
         if: always()
         run: |
@@ -151,7 +151,6 @@ jobs:
           -Dexec.mainClass=org.openjdk.jmh.Main
           -Dexec.classpathScope=test
           -Dexec.args="StreamBufferThroughputBenchmark -wi 2 -i 3 -f 0 -rf json -rff target/jmh-results.json"
-          -Dmaven.javadoc.skip=true
         continue-on-error: true
       - uses: actions/upload-artifact@v7
         if: always()