fix(bb): unbreak fuzzing/asan/smt/format builds blocking merge-train

These four barretenberg C++ breaks arrived via next (git log
origin/next..HEAD shows 0 train commits touching them) and abort the
full CI build before the e2e suite runs, blocking merge-train #23253:

- common/fuzzer.hpp: add <cstring> for std::memcpy (bb-cpp-fuzzing)
- commitment_schemes_recursion/shplemini.test.cpp: include
  flavor/ultra_flavor.hpp for complete bb::UltraFlavor (bb-cpp-asan)
- smt_verification/util/smt_util.cpp: include
  stdlib_circuit_builders/ultra_circuit_builder.hpp for the full
  UltraCircuitBuilder_ template (bb-cpp-smt)
- api/api_chonk.cpp: clang-format-20 (bb-cpp-format-check)

Folded into the spartan train to unblock it per operator direction.

Author: AztecBot

barretenberg/cpp/src/barretenberg/api/api_chonk.cpp

@@ -33,10 +33,9 @@ namespace { // anonymous namespace
  */
 void write_chonk_vk(std::vector<uint8_t> bytecode, const std::filesystem::path& output_path, const API::Flags& flags)
 {
-    auto response =
-        bbapi::ChonkComputeVk{ .circuit = { .name = "", .bytecode = std::move(bytecode) },
-                               .use_zk_flavor = flags.use_zk_flavor }
-            .execute();
+    auto response = bbapi::ChonkComputeVk{ .circuit = { .name = "", .bytecode = std::move(bytecode) },
+                                           .use_zk_flavor = flags.use_zk_flavor }
+                        .execute();
 
     const bool is_stdout = output_path == "-";
     if (is_stdout) {

barretenberg/cpp/src/barretenberg/commitment_schemes_recursion/shplemini.test.cpp

@@ -4,6 +4,7 @@
 #include "barretenberg/commitment_schemes/pcs_test_utils.hpp"
 #include "barretenberg/commitment_schemes/utils/mock_witness_generator.hpp"
 #include "barretenberg/eccvm/eccvm_prover.hpp"
+#include "barretenberg/flavor/ultra_flavor.hpp"
 #include "barretenberg/srs/global_crs.hpp"
 #include "barretenberg/stdlib/primitives/curves/bn254.hpp"
 #include "barretenberg/stdlib/primitives/pairing_points.hpp"

barretenberg/cpp/src/barretenberg/common/fuzzer.hpp

@@ -2,6 +2,7 @@
 #include "barretenberg/circuit_checker/circuit_checker.hpp"
 #include "barretenberg/common/assert.hpp"
 #include "barretenberg/numeric/uint256/uint256.hpp"
+#include <cstring>
 
 // NOLINTBEGIN(cppcoreguidelines-macro-usage, google-runtime-int)
 #define PARENS ()

barretenberg/cpp/src/barretenberg/smt_verification/util/smt_util.cpp

@@ -1,5 +1,7 @@
 #include "smt_util.hpp"
 
+#include "barretenberg/stdlib_circuit_builders/ultra_circuit_builder.hpp"
+
 /**
  * @brief Converts a string of an arbitrary base to fr.
  * Note: there should be no prefix