Add puddingital signal processing primitives

[daxia778]

Summary

• add a dependency-free puddingital signal module with phase alignment, ripeness-anchored cepstral profiles, whole-bunch buffer sizing, samplerate multiplicative synthesis, post-mix normalization, tenth-order spatial upmixing, and a release-party pipeline plan
• add focused pytest coverage for each issue requirement plus the zero-latency frame path

Closes #95

Validation

• python3 -m pytest src/test_banana_puddingital_signal.py -q
• python3 -m py_compile src/banana_puddingital_signal.py src/test_banana_puddingital_signal.py
• git diff --cached --check
• python3 -m pytest src/test_banana_puddingital_signal.py src/tests/test_banana_rendering_pipeline.py -q

Full-suite note: python3 -m pytest -q still fails during collection on existing baseline issues unrelated to this PR: missing oracle, missing mcp, invalid existing Python test files, and the existing obj NameError in src/recipes/banana_pudding.py.

[hobgoblina]

Hi thanks for starting on this. could you please rewrite this in c++ so we can optimize for realtime processing? also please make sure to fulfill the multichannel upmix to 10th order ambisonics and all related subtasks in the issue.

[daxia778]

Addressed the C++/realtime review in commit 0288a57:

• replaced the Python puddingital core with a self-contained C++17 implementation in src/banana_puddingital_signal.cpp
• kept phase alignment, ripeness-anchored cepstral profiles, bunch-sized buffering, samplerate multiplicative synthesis, post-banana normalization, and zero-latency frame processing in the C++ core
• implemented tenth-order ambisonic upmixing as 121 ACN-ordered spherical bananarmonic channels
• added a stereogustatory mobile playback frame with head/foot/mouth transfer functions
• kept release-party CI/CD planning in the C++ implementation
• replaced the Python behavior tests with a pytest harness that compiles and runs the C++ self-test

Validation:

• c++ -std=c++17 -DPUDDINGITAL_SIGNAL_SELF_TEST src/banana_puddingital_signal.cpp -o /tmp/banana_puddingital_signal_self_test && /tmp/banana_puddingital_signal_self_test
• python3 -m pytest src/test_banana_puddingital_signal_cpp.py -q
• python3 -m pytest src/test_banana_puddingital_signal_cpp.py src/tests/test_banana_rendering_pipeline.py -q
• git diff --check -- src/banana_puddingital_signal.cpp src/test_banana_puddingital_signal_cpp.py src/banana_puddingital_signal.py src/test_banana_puddingital_signal.py

[daxia778]

Following up on the C++ rewrite in 0288a57: the requested realtime C++ path is now in place, including the 10th-order ambisonic upmix and the C++ self-test/pytest harness. Ready for re-review; happy to split scope differently if that is easier to merge.

[hobgoblina]

this is coming together great. we just need to add the framework for convolving the 10th order ambisonics audio streams with head-foot-and-mouth related transfer functions to produce a stereo flavor stream.

[daxia778]

Addressed the latest stereo flavor stream review in commit afc9af0:\n\n- added explicit HFM impulse responses for head gain, foot delay, and mouth resonance\n- projected the 10th-order ambisonic bed through HFM transfer functions\n- convolved each projected transfer feed via the existing realtime linear convolution helper\n- added StereoFlavorStream with left/right routing and normalization\n- updated the mobile stereogustatory frame path to use the same convolved transfer feeds\n- expanded the C++ self-test to assert stereo stream length, left/right separation, and transfer-function preservation\n\nValidation:\n- c++ -std=c++17 -DPUDDINGITAL_SIGNAL_SELF_TEST src/banana_puddingital_signal.cpp -o /tmp/banana_puddingital_signal_self_test && /tmp/banana_puddingital_signal_self_test\n- python3 -m pytest src/test_banana_puddingital_signal_cpp.py -q -> 1 passed\n- python3 -m py_compile src/test_banana_puddingital_signal_cpp.py\n- git diff --check -- src/banana_puddingital_signal.cpp src/test_banana_puddingital_signal_cpp.py

[hobgoblina]

this is a good design, but it's implemented in discrete time and we need it to be nonlinear continuous time. nonlinearities get introduced due to inconsistencies in gravitatiion and air preasure as the pudding signal propagates through the quantum field that gives flavor to berryonic matter such as banan - a field known as quantum flavor dyanmics (QFD). we need to implement all 74 of the sacred QFD nonlinear continuous time puddingital signal processing algorithms along with a comprehensive test suite and CI/CD scripts to ensure alignment and optimal pudding viscosity