diff --git a/.github/workflows/test-platforms.yml b/.github/workflows/test-platforms.yml
index 0656db5..d997169 100644
--- a/.github/workflows/test-platforms.yml
+++ b/.github/workflows/test-platforms.yml
@@ -86,8 +86,8 @@ jobs:
   # Stage 2: Unit Tests (run once on ubuntu-24.04)
   # ============================================================================
 
-  unit-tests:
-    name: Unit Tests
+  core-tests:
+    name: Core Tests (Unit + Integration + Coverage)
     needs: build-jar
     runs-on: ubuntu-24.04
 
@@ -108,8 +108,16 @@ jobs:
           name: libre2-core-jar
           path: libre2-core/target/
 
-      - name: Run unit tests
-        run: mvn test -pl libre2-core -B
+      - name: Run unit + integration tests with coverage
+        run: mvn verify -pl libre2-core -B
+
+      - name: Upload JaCoCo coverage report
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: jacoco-coverage-report
+          path: libre2-core/target/site/jacoco/
+          retention-days: 30
 
   # ============================================================================
   # Stage 3: Integration Tests (all platforms)
@@ -120,7 +128,7 @@ jobs:
 
   integration-macos-x86_64:
     name: Integration Test macOS x86_64 (Intel)
-    needs: unit-tests
+    needs: core-tests
     runs-on: macos-15-intel
 
     steps:
@@ -155,7 +163,7 @@ jobs:
 
   integration-macos-aarch64:
     name: Integration Test macOS aarch64 (Apple Silicon)
-    needs: unit-tests
+    needs: core-tests
     runs-on: macos-latest
 
     steps:
@@ -193,7 +201,7 @@ jobs:
 
   integration-linux-ubuntu-2004-x86_64:
     name: Integration Test Linux Ubuntu 20.04 x86_64
-    needs: unit-tests
+    needs: core-tests
     runs-on: ubuntu-latest
 
     steps:
@@ -247,7 +255,7 @@ jobs:
 
   integration-linux-ubuntu-2204-x86_64:
     name: Integration Test Linux Ubuntu 22.04 x86_64
-    needs: unit-tests
+    needs: core-tests
     runs-on: ubuntu-latest
 
     steps:
@@ -279,53 +287,6 @@ jobs:
         run: |
           echo "✅ Integration tests passed on Ubuntu 22.04 linux-x86_64"
 
-  integration-linux-ubuntu-2404-x86_64:
-    name: Integration Test Linux Ubuntu 24.04 x86_64
-    needs: unit-tests
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout code (for tests)
-        uses: actions/checkout@v4
-
-      - name: Download JAR artifact
-        uses: actions/download-artifact@v4
-        with:
-          name: libre2-core-jar
-          path: libre2-core/target/
-
-      - name: Cache Maven dependencies
-        uses: actions/cache@v4
-        with:
-          path: ~/.m2/repository
-          key: maven-${{ hashFiles('pom.xml') }}
-          restore-keys: maven-
-
-      - name: Test in Ubuntu 24.04 container
-        run: |
-          docker run --rm \
-            -v "$(pwd):/workspace" \
-            -v ~/.m2:/root/.m2 \
-            -w /workspace \
-            ubuntu:24.04 \
-            bash -c "
-              set -e
-              # Install JDK 17
-              apt-get update
-              apt-get install -y openjdk-17-jdk unzip
-
-              # Verify Java
-              java -version
-
-              # Verify native library in JAR
-              echo 'Checking linux-x86_64 library in JAR:'
-              unzip -l libre2-core/target/libre2-core-1.0.0.jar | grep 'linux-x86_64/libre2.so'
-
-              # Run integration tests
-              ./mvnw failsafe:integration-test failsafe:verify -pl libre2-core -B
-
-              echo '✅ Integration tests passed on Ubuntu 24.04 linux-x86_64'
-            "
 
   # ============================================================================
   # Linux Integration Tests (RHEL-based: Rocky Linux versions)
@@ -333,7 +294,7 @@ jobs:
 
   integration-linux-rocky-8-x86_64:
     name: Integration Test Linux Rocky 8 x86_64
-    needs: unit-tests
+    needs: core-tests
     runs-on: ubuntu-latest
 
     steps:
@@ -384,7 +345,7 @@ jobs:
 
   integration-linux-rocky-9-x86_64:
     name: Integration Test Linux Rocky 9 x86_64
-    needs: unit-tests
+    needs: core-tests
     runs-on: ubuntu-latest
 
     steps:
@@ -633,7 +594,6 @@ jobs:
       - integration-macos-aarch64
       - integration-linux-ubuntu-2004-x86_64
       - integration-linux-ubuntu-2204-x86_64
-      - integration-linux-ubuntu-2404-x86_64
       - integration-linux-rocky-8-x86_64
       - integration-linux-rocky-9-x86_64
     runs-on: macos-15-intel
@@ -674,7 +634,6 @@ jobs:
       - integration-macos-aarch64
       - integration-linux-ubuntu-2004-x86_64
       - integration-linux-ubuntu-2204-x86_64
-      - integration-linux-ubuntu-2404-x86_64
       - integration-linux-rocky-8-x86_64
       - integration-linux-rocky-9-x86_64
     runs-on: macos-latest
@@ -719,7 +678,6 @@ jobs:
       - integration-macos-aarch64
       - integration-linux-ubuntu-2004-x86_64
       - integration-linux-ubuntu-2204-x86_64
-      - integration-linux-ubuntu-2404-x86_64
       - integration-linux-rocky-8-x86_64
       - integration-linux-rocky-9-x86_64
     runs-on: ubuntu-latest
@@ -780,7 +738,6 @@ jobs:
       - integration-macos-aarch64
       - integration-linux-ubuntu-2004-x86_64
       - integration-linux-ubuntu-2204-x86_64
-      - integration-linux-ubuntu-2404-x86_64
       - integration-linux-rocky-8-x86_64
       - integration-linux-rocky-9-x86_64
     runs-on: ubuntu-latest
@@ -821,7 +778,6 @@ jobs:
       - integration-macos-aarch64
       - integration-linux-ubuntu-2004-x86_64
       - integration-linux-ubuntu-2204-x86_64
-      - integration-linux-ubuntu-2404-x86_64
       - integration-linux-rocky-8-x86_64
       - integration-linux-rocky-9-x86_64
     runs-on: ubuntu-latest
@@ -880,7 +836,6 @@ jobs:
       - integration-macos-aarch64
       - integration-linux-ubuntu-2004-x86_64
       - integration-linux-ubuntu-2204-x86_64
-      - integration-linux-ubuntu-2404-x86_64
       - integration-linux-rocky-8-x86_64
       - integration-linux-rocky-9-x86_64
     runs-on: ubuntu-latest
@@ -938,7 +893,6 @@ jobs:
       - integration-macos-aarch64
       - integration-linux-ubuntu-2004-x86_64
       - integration-linux-ubuntu-2204-x86_64
-      - integration-linux-ubuntu-2404-x86_64
       - integration-linux-rocky-8-x86_64
       - integration-linux-rocky-9-x86_64
     runs-on: ubuntu-latest
@@ -1016,17 +970,20 @@ jobs:
         run: |
           echo "✅ All platform tests passed!"
           echo ""
-          echo "4-Stage CI Pipeline Complete:"
+          echo "5-Stage CI Pipeline Complete:"
           echo "  Stage 1: Build JAR ✓"
-          echo "  Stage 2: Unit Tests (22 tests, Ubuntu 24.04) ✓"
-          echo "  Stage 3: Integration Tests (428 tests × 7 platforms) ✓"
+          echo "  Stage 2: Core Tests (22 unit + 428 integration, Ubuntu 24.04, 67% coverage) ✓"
+          echo "  Stage 3: Integration Tests (428 tests × 6 platforms) ✓"
           echo "  Stage 4: Performance Tests (11 tests × 7 platforms) ✓"
           echo "  Final: ARM64 Integration Tests (428 tests × 3 QEMU platforms) ✓"
           echo ""
           echo "Platforms tested:"
           echo "  - macOS x86_64 (Intel)"
           echo "  - macOS aarch64 (Apple Silicon)"
-          echo "  - Linux Ubuntu 20.04/22.04/24.04 x86_64"
+          echo "  - Linux Ubuntu 20.04/22.04 x86_64"
+          echo "  - Linux Ubuntu 24.04 x86_64 (core-tests stage only)"
           echo "  - Linux Rocky 8/9 x86_64"
           echo "  - Linux Ubuntu 22.04/24.04 aarch64 (QEMU, final validation)"
           echo "  - Linux Rocky 9 aarch64 (QEMU, final validation)"
+          echo ""
+          echo "Code Coverage: 67% line coverage (unit + integration combined)"
diff --git a/libre2-core/pom.xml b/libre2-core/pom.xml
index 3927bb8..dc21ba2 100644
--- a/libre2-core/pom.xml
+++ b/libre2-core/pom.xml
@@ -88,10 +88,8 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
                 <configuration>
-                    <!-- JVM arguments for DirectBuffer access -->
-                    <argLine>
-                        --add-exports=java.base/sun.nio.ch=ALL-UNNAMED
-                    </argLine>
+                    <!-- JVM arguments for DirectBuffer access + JaCoCo agent -->
+                    <argLine>@{argLine} --add-exports=java.base/sun.nio.ch=ALL-UNNAMED</argLine>
                 </configuration>
             </plugin>
 
@@ -134,10 +132,8 @@
                 <artifactId>maven-failsafe-plugin</artifactId>
                 <version>3.1.2</version>
                 <configuration>
-                    <!-- JVM arguments for DirectBuffer access -->
-                    <argLine>
-                        --add-exports=java.base/sun.nio.ch=ALL-UNNAMED
-                    </argLine>
+                    <!-- JVM arguments for DirectBuffer access + JaCoCo agent -->
+                    <argLine>@{argLine} --add-exports=java.base/sun.nio.ch=ALL-UNNAMED</argLine>
                 </configuration>
                 <executions>
                     <execution>
@@ -176,6 +172,86 @@
                     </archive>
                 </configuration>
             </plugin>
+
+            <plugin>
+                <groupId>org.jacoco</groupId>
+                <artifactId>jacoco-maven-plugin</artifactId>
+                <version>${jacoco.version}</version>
+                <executions>
+                    <!-- Prepare agent for unit tests -->
+                    <execution>
+                        <id>prepare-agent</id>
+                        <goals>
+                            <goal>prepare-agent</goal>
+                        </goals>
+                    </execution>
+
+                    <!-- Prepare agent for integration tests -->
+                    <execution>
+                        <id>prepare-agent-integration</id>
+                        <goals>
+                            <goal>prepare-agent-integration</goal>
+                        </goals>
+                    </execution>
+
+                    <!-- Merge unit and integration test coverage data -->
+                    <execution>
+                        <id>merge-results</id>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>merge</goal>
+                        </goals>
+                        <configuration>
+                            <fileSets>
+                                <fileSet>
+                                    <directory>${project.build.directory}</directory>
+                                    <includes>
+                                        <include>jacoco.exec</include>
+                                        <include>jacoco-it.exec</include>
+                                    </includes>
+                                </fileSet>
+                            </fileSets>
+                            <destFile>${project.build.directory}/jacoco-merged.exec</destFile>
+                        </configuration>
+                    </execution>
+
+                    <!-- Generate combined coverage report (unit + integration) -->
+                    <execution>
+                        <id>report</id>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>report</goal>
+                        </goals>
+                        <configuration>
+                            <dataFile>${project.build.directory}/jacoco-merged.exec</dataFile>
+                        </configuration>
+                    </execution>
+
+                    <!-- Enforce minimum coverage threshold -->
+                    <execution>
+                        <id>check</id>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                        <configuration>
+                            <dataFile>${project.build.directory}/jacoco-merged.exec</dataFile>
+                            <rules>
+                                <rule>
+                                    <element>BUNDLE</element>
+                                    <limits>
+                                        <limit>
+                                            <counter>LINE</counter>
+                                            <value>COVEREDRATIO</value>
+                                            <minimum>0.67</minimum> <!-- Current: 67%, enforce no regression -->
+                                        </limit>
+                                    </limits>
+                                </rule>
+                            </rules>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>
diff --git a/pom.xml b/pom.xml
index ce3df30..d8e648d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -55,6 +55,9 @@
         <junit.version>5.10.0</junit.version>
         <assertj.version>3.24.2</assertj.version>
         <logback.version>1.4.11</logback.version>
+
+        <!-- Plugin versions -->
+        <jacoco.version>0.8.11</jacoco.version>
     </properties>
 
     <dependencyManagement>