perf: reduce java-tracer E2E to single function for ~11 min target

Drop repeatString from the Workload fixture (2→1 function).
computeSum alone exercises the full tracer→optimizer pipeline
(trace → replay tests → optimize → evaluate → rank → explain → review).
The second function added no additional pipeline coverage.

Author: KRRT7

tests/test_languages/fixtures/java_tracer_e2e/src/main/java/com/example/Workload.java

@@ -10,26 +10,15 @@ public static int computeSum(int n) {
         return sum;
     }
 
-    public static String repeatString(String s, int count) {
-        String result = "";
-        for (int i = 0; i < count; i++) {
-            result = result + s;
-        }
-        return result;
-    }
-
     public static void main(String[] args) {
-        // Run methods with large inputs so JFR can capture CPU samples.
+        // Run with large inputs so JFR can capture CPU samples.
         // Small inputs finish too fast (<1ms) for JFR's 10ms sampling interval.
-        // 100 rounds is enough for JFR to collect ~10 samples per function.
         for (int round = 0; round < 100; round++) {
             computeSum(100_000);
-            repeatString("hello world ", 1000);
         }
 
         // Also call with small inputs for variety in traced args
         System.out.println("computeSum(100) = " + computeSum(100));
-        System.out.println("repeatString(\"ab\", 3) = " + repeatString("ab", 3));
 
         System.out.println("Workload complete.");
     }

tests/test_languages/test_java/test_java_tracer_e2e.py

@@ -81,12 +81,11 @@ def test_agent_captures_invocations(self, compiled_workload: Path, trace_db: Pat
         conn = sqlite3.connect(str(trace_db))
         try:
             rows = conn.execute("SELECT function, classname, descriptor, length(args) FROM function_calls").fetchall()
-            assert len(rows) >= 3, f"Expected at least 3 captured invocations, got {len(rows)}"
+            assert len(rows) >= 2, f"Expected at least 2 captured invocations, got {len(rows)}"
 
             # Check that specific methods were captured
             functions = {row[0] for row in rows}
             assert "computeSum" in functions
-            assert "repeatString" in functions
 
             # Verify all rows have non-empty args blobs
             for row in rows:
@@ -95,7 +94,7 @@ def test_agent_captures_invocations(self, compiled_workload: Path, trace_db: Pat
             # Verify metadata
             metadata = dict(conn.execute("SELECT key, value FROM metadata").fetchall())
             assert "totalCaptures" in metadata
-            assert int(metadata["totalCaptures"]) >= 3
+            assert int(metadata["totalCaptures"]) >= 2
         finally:
             conn.close()
 
@@ -294,7 +293,6 @@ def test_full_trace_and_replay_generation(self, compiled_workload: Path, tmp_pat
         assert len(workload_files) == 1
         content = workload_files[0].read_text(encoding="utf-8")
         assert "replay_computeSum" in content
-        assert "replay_repeatString" in content
 
     def test_package_detection(self) -> None:
         """Test that package detection finds Java packages from source files."""