Replace Python numerical kernels with native C execution

constraints/python312-direct.txt

@@ -6,7 +6,5 @@
 # pins in a clean CPython 3.12 environment when intentionally upgrading them.
 fastapi==0.141.1
 lxml==6.1.1
-numpy==2.5.2
 pydantic==2.13.4
-scipy==1.18.0
 uvicorn==0.52.3

constraints/python312-linux-x86_64.lock

@@ -16,12 +16,10 @@ h11==0.16.0 --hash=sha256:63cf8bbe7522de3bf65932fda1d9c2772064ffb3dae62d55932da5
 httptools==0.8.0 --hash=sha256:b15fc622b0f869d19207c4089a501d9bcc63ca5e071ffdd2f03f922df882dcb2
 idna==3.18 --hash=sha256:7f952cbe720b688055e3f87de14f5c3e5fdaa8bc3928985c4077ca689de849a2
 lxml==6.1.1 --hash=sha256:ebe6af670449830d6d9b752c256a983291c766a1365ba5d5460048f9e33a7818
-numpy==2.5.2 --hash=sha256:3cdec01fa790a186d430433fdd4d4ffb70eed6f0eeb4bf05c8dbe2dce0a9bcb8
 pydantic==2.13.4 --hash=sha256:45a282cde31d808236fd7ea9d919b128653c8b38b393d1c4ab335c62924d9aba
 pydantic-core==2.46.4 --hash=sha256:926c9541b14b12b1681dca8a0b75feb510b06c6341b70a8e500c2fdcff837cce
 python-dotenv==1.2.3 --hash=sha256:904552145e8bfed22162c09dab1c2b9b54fefa7b23ba780f4f26ca0316b0f0d9
 PyYAML==6.0.3 --hash=sha256:ba1cc08a7ccde2d2ec775841541641e4548226580ab850948cbfda66a1befcdc
-scipy==1.18.0 --hash=sha256:1f55797419e16e7f30cf88ffb3113ce0467f00cfe3f70d5c281730b21769bfc2
 starlette==1.6.0 --hash=sha256:a86dd39d14bb45f85a3d18525215a9ef0cfd1f192ac793220e72598c90335f0c
 typing-extensions==4.16.0 --hash=sha256:481caa481374e813c1b176ada14e97f1f67a4539ce9cfeb3f350d78d6370c2e8
 typing-inspection==0.4.4 --hash=sha256:65b8397ba37ccbce054456aaccddfc91e6e3083c92824df348d96ca832f3f147