refactor(dynamic): standardize shell commands across fixtures, add __NYX_SINK_HIT__ markers, improve PHP support

tests/dynamic_fixtures/class_method/java/Benign.java

@@ -1,20 +1,16 @@
 // Phase 19 (Track M.1) — class-method benign control for Java.
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.PreparedStatement;
-import java.sql.SQLException;
-
+//
+// The payload is passed as an argv element to true(1), so no shell parses or
+// echoes marker bytes.
 public class Benign {
     public static class UserRepository {
         public UserRepository() {}
 
-        public void findByName(String name) throws SQLException {
-            Connection c = DriverManager.getConnection("jdbc:sqlite::memory:");
-            PreparedStatement ps = c.prepareStatement("SELECT id FROM users WHERE name = ?");
-            ps.setString(1, name);
-            ps.execute();
-            ps.close();
-            c.close();
+        public void findByName(String name) throws Exception {
+            Process p = new ProcessBuilder("/usr/bin/true", name)
+                .redirectErrorStream(true)
+                .start();
+            p.waitFor();
         }
     }
 }