CI: pin numpy<2.5 to keep R parity cache keys stable

.github/workflows/inspect-r-api-update.yml

@@ -72,7 +72,11 @@ jobs:
       - name: Install Python build and test tools
         run: |
           python -m pip install -U pip
-          python -m pip install build scikit-build-core nanobind pytest ruff mypy numpy scipy
+          # numpy pinned <2.5: the R parity cache keys hash test inputs generated via
+          # multivariate_normal (LAPACK SVD). numpy 2.5.x bundles an OpenBLAS whose SVD
+          # kernels differ on some runner CPUs, changing inputs bit-for-bit and causing
+          # cache misses. Re-evaluate at the next full live-R cache regeneration.
+          python -m pip install build scikit-build-core nanobind pytest ruff mypy "numpy<2.5" scipy
           python -m pip install hypothesis pytest-benchmark pytest-xdist
 
       - name: Plan R API parity review

.github/workflows/native-backend-ci.yml

@@ -25,7 +25,11 @@ jobs:
       - name: Install build tools
         run: |
           python -m pip install -U pip
-          python -m pip install build scikit-build-core nanobind pytest ruff mypy numpy scipy
+          # numpy pinned <2.5: the R parity cache keys hash test inputs generated via
+          # multivariate_normal (LAPACK SVD). numpy 2.5.x bundles an OpenBLAS whose SVD
+          # kernels differ on some runner CPUs, changing inputs bit-for-bit and causing
+          # cache misses. Re-evaluate at the next full live-R cache regeneration.
+          python -m pip install build scikit-build-core nanobind pytest ruff mypy "numpy<2.5" scipy
           python -m pip install hypothesis pytest-benchmark pytest-xdist
 
       - name: Install package editable

.github/workflows/parity-autofix.yml

@@ -86,7 +86,11 @@ jobs:
       - name: Install Python build and test tools
         run: |
           python -m pip install -U pip
-          python -m pip install build scikit-build-core nanobind pytest ruff mypy numpy scipy
+          # numpy pinned <2.5: the R parity cache keys hash test inputs generated via
+          # multivariate_normal (LAPACK SVD). numpy 2.5.x bundles an OpenBLAS whose SVD
+          # kernels differ on some runner CPUs, changing inputs bit-for-bit and causing
+          # cache misses. Re-evaluate at the next full live-R cache regeneration.
+          python -m pip install build scikit-build-core nanobind pytest ruff mypy "numpy<2.5" scipy
           python -m pip install hypothesis pytest-benchmark pytest-xdist
 
       - name: Install package editable

.github/workflows/sync-from-nns-core.yml

@@ -69,7 +69,11 @@ jobs:
       - name: Install build tools
         run: |
           python -m pip install -U pip
-          python -m pip install build scikit-build-core nanobind pytest ruff mypy numpy scipy
+          # numpy pinned <2.5: the R parity cache keys hash test inputs generated via
+          # multivariate_normal (LAPACK SVD). numpy 2.5.x bundles an OpenBLAS whose SVD
+          # kernels differ on some runner CPUs, changing inputs bit-for-bit and causing
+          # cache misses. Re-evaluate at the next full live-R cache regeneration.
+          python -m pip install build scikit-build-core nanobind pytest ruff mypy "numpy<2.5" scipy
           python -m pip install hypothesis pytest-benchmark pytest-xdist
 
       - name: Vendor NNS-core snapshot