code: clean up javac -Xlint warnings (unchecked, serial, redundant cast)

- TournamentAnalyzer.slaterExact: replace the generic-array sentinel

  `List<String>[] bestOrder = new List[]{...}` (which forced an

  `[unchecked] unchecked conversion` warning and the only suppression-

  free generic-array allocation in the file) with a type-safe

  single-element `List<List<String>>`. Same algorithm, same mutation

  semantics through the branch-and-bound recursion, zero warnings.

- GraphInfluenceSeedAdvisor.synthesize: drop two `(double)` casts on

  values that are already declared `double` (`expectedCoverage` and

  `baseline`). Flagged by `-Xlint:cast` as redundant.

- Add `serialVersionUID = 1L` to four Swing classes that extend

  `JComponent`/`JFrame`/`JDialog` (AdjacencyMatrixHeatmap, Main,

  StatsPanel, RandomGraphDialog). These are `Serializable` by

  inheritance and were each emitting `[serial] no definition of

  serialVersionUID`; the JDK uses an implementation-specific hash

  when the field is missing, so any future field reorder silently

  breaks deserialization.

Verification: `mvn clean compile` is clean of the targeted warnings

(unchecked / cast / serial). `mvn test` for the touched classes:

TournamentAnalyzerTest 76/76 pass, GraphInfluenceSeedAdvisorTest 14/14

pass. Full `mvn test` shows the same 27 failures + 8 errors as on

origin/master (LinkPredictionAnalyzerTest, GraphLabelingAnalyzerTest,

etc.) — pre-existing, unrelated to this change.

Author: Repo Gardener

Gvisual/src/gvisual/AdjacencyMatrixHeatmap.java

@@ -26,6 +26,8 @@
  */
 public class AdjacencyMatrixHeatmap extends JPanel {
 
+    private static final long serialVersionUID = 1L;
+
     private final Graph<String, Edge> graph;
     private List<String> nodeOrder;
     private final Map<String, Map<String, Edge>> adjacency;

Gvisual/src/gvisual/GraphInfluenceSeedAdvisor.java

@@ -428,12 +428,12 @@ public int compare(Integer a, Integer b) {
         double reductionFraction = 0.0;
         if (mode == Mode.SPREAD) {
             expectedCoverage = finalDecisions.isEmpty() ? 0.0 : finalDecisions.get(finalDecisions.size() - 1).coverageEstimate;
-            coverageFraction = (double) expectedCoverage / n;
+            coverageFraction = expectedCoverage / n;
         } else {
             double remaining = finalDecisions.isEmpty() ? baseline : finalDecisions.get(finalDecisions.size() - 1).coverageEstimate;
             expectedCoverage = remaining;
             expectedReduction = baseline - remaining;
-            coverageFraction = (double) baseline / n;
+            coverageFraction = baseline / n;
             reductionFraction = baseline > 0 ? expectedReduction / baseline : 0.0;
         }
 

Gvisual/src/gvisual/Main.java

@@ -75,6 +75,8 @@
  */
 public class Main extends JFrame {
 
+    private static final long serialVersionUID = 1L;
+
     private static final Logger LOGGER = Logger.getLogger(Main.class.getName());
     private static final Color DEFAULT_BG_COLOR = Color.BLACK;
     private static final Color Vertex_COLOR = Color.WHITE;

Gvisual/src/gvisual/RandomGraphDialog.java

@@ -28,6 +28,8 @@
  */
 public class RandomGraphDialog extends JDialog {
 
+    private static final long serialVersionUID = 1L;
+
     private Graph<String, Edge> generatedGraph = null;
 
     private final JComboBox<String> modelCombo;

Gvisual/src/gvisual/StatsPanel.java

@@ -15,6 +15,8 @@
  */
 public class StatsPanel extends JPanel {
 
+    private static final long serialVersionUID = 1L;
+
     private static final Font LABEL_FONT = new Font("SansSerif", Font.PLAIN, 12);
 
     private final JLabel statsNodeCount;

Gvisual/src/gvisual/TournamentAnalyzer.java

@@ -788,13 +788,14 @@ private SlaterResult slaterExact(List<RankEntry> copeland) {
         // Use greedy result as initial upper bound for pruning
         SlaterResult greedy = slaterGreedy(copeland);
         int[] bestDisagreements = {greedy.getDisagreements()};
-        List<String>[] bestOrder = new List[]{new ArrayList<>(greedy.getRanking())};
+        List<List<String>> bestOrder = new ArrayList<>(1);
+        bestOrder.add(new ArrayList<>(greedy.getRanking()));
 
         boolean[] used = new boolean[n];
         List<String> current = new ArrayList<>(n);
 
         slaterBranchAndBound(current, used, 0, bestDisagreements, bestOrder);
-        return new SlaterResult(bestOrder[0], bestDisagreements[0]);
+        return new SlaterResult(bestOrder.get(0), bestDisagreements[0]);
     }
 
     /**
@@ -806,18 +807,18 @@ private SlaterResult slaterExact(List<RankEntry> copeland) {
      * @param used       which vertex indices are already placed
      * @param partialDis disagreements accumulated in the partial ordering
      * @param bestDis    single-element array holding the best disagreement count
-     * @param bestOrder  single-element array holding the best ordering found
+     * @param bestOrder  single-element list holding the best ordering found
      */
     private void slaterBranchAndBound(List<String> current, boolean[] used,
                                        int partialDis, int[] bestDis,
-                                       List<String>[] bestOrder) {
+                                       List<List<String>> bestOrder) {
         int pos = current.size();
         int n = vertices.size();
 
         if (pos == n) {
             if (partialDis < bestDis[0]) {
                 bestDis[0] = partialDis;
-                bestOrder[0] = new ArrayList<>(current);
+                bestOrder.set(0, new ArrayList<>(current));
             }
             return;
         }