QVAC-18966: tts-cpp — add missing <atomic> include in chatterbox_tts.cpp

[Zbig9000]

Summary

One-line fix. tts-cpp/src/chatterbox_tts.cpp declares

static std::atomic<int> g_s3gen_cache_refcount{0};

at line ~189 (and later uses .fetch_add(), .fetch_sub(), .store()), but the translation unit never #include <atomic> directly. libstdc++ has historically exposed std::atomic transitively via <mutex> so the build appears clean on most setups, but the transitive path is being trimmed in the ggml-speech v0.10.2 sync currently in flight on tetherto/qvac-ext-ggml#13. On the merged speech HEAD, chatterbox_tts.cpp fails to compile with:

chatterbox_tts.cpp:189:30: error: aggregate 'std::atomic<int> g_s3gen_cache_refcount'
                                  has incomplete type and cannot be defined

The fault reproduces on the pre-merge speech HEAD too if you trim a few headers — the include chain has just been hiding a latent bug.

Add #include <atomic> explicitly. No behavioural change; safe under any header transitivity.

Tasks

• QVAC-18966 (Asana) — TTS-GGML CPU regression / build-fix series. This is the build half (chatterbox_tts.cpp no longer relies on transitive <atomic>).

Validation

Clean rebuild of tts-cpp (master + this PR) against a shared-libs install of tetherto/qvac-ext-ggml#13 HEAD 45dbdecd (the day-2 v0.10.2 merge target):

# install ggml-speech as shared libs
cmake -S qvac-ext-ggml -B build-install -G Ninja \
  -DCMAKE_BUILD_TYPE=Release \
  -DCMAKE_INSTALL_PREFIX=/tmp/ggml-speech-install/usr/local \
  -DBUILD_SHARED_LIBS=ON -DGGML_LIB_OUTPUT_PREFIX=qvac-speech- \
  -DGGML_VULKAN=ON -DGGML_NATIVE=OFF
cmake --build build-install -j && cmake --install build-install

# rebuild tts-cpp against it
cmake -S qvac-ext-lib-whisper.cpp/tts-cpp -B tts-validate -G Ninja \
  -DCMAKE_BUILD_TYPE=Release \
  -DCMAKE_PREFIX_PATH="…;/tmp/ggml-speech-install/usr/local" \
  -DTTS_CPP_BUILD_LIBRARY=ON
cmake --build tts-validate -j
# -> libtts-cpp.a built clean, chatterbox_tts.cpp.o compiled in 3 variants

Notes

• Purely additive (a single #include <atomic> line). Independent of every other PR in the QVAC-18991 / 18992 / 18993 series.
• Cherry-picked off the combined QVAC-18993-bundled-ggml-android-dynamic-backend branch where it was originally written; that combined branch will be closed in favour of this PR (single-concern) plus the QVAC-18993 ggml-bundled PR (the other two commits).

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