diff --git a/.ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9is_rcTrue.yaml b/.ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9github_actions_labelscirun-openstack-gpu-2xlargeis_rcTrue.yaml
similarity index 100%
rename from .ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9is_rcTrue.yaml
rename to .ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9github_actions_labelscirun-openstack-gpu-2xlargeis_rcTrue.yaml
diff --git a/.ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue.yaml b/.ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue.yaml
similarity index 97%
rename from .ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue.yaml
rename to .ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue.yaml
index aa311390d..d3b10fa26 100644
--- a/.ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue.yaml
+++ b/.ci_support/linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue.yaml
@@ -27,7 +27,7 @@ docker_image:
 fmt:
 - '12.0'
 github_actions_labels:
-- cirun-openstack-gpu-2xlarge
+- cirun-openstack-cpu-xlarge
 is_rc:
 - 'True'
 libabseil:
diff --git a/.ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9is_rcTrue.yaml b/.ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9github_actions_labelscirun-openstack-gpu-2xlargeis_rcTrue.yaml
similarity index 100%
rename from .ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9is_rcTrue.yaml
rename to .ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9github_actions_labelscirun-openstack-gpu-2xlargeis_rcTrue.yaml
diff --git a/.ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue.yaml b/.ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue.yaml
similarity index 97%
rename from .ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue.yaml
rename to .ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue.yaml
index e413beb1a..b33f2a001 100644
--- a/.ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue.yaml
+++ b/.ci_support/linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue.yaml
@@ -27,7 +27,7 @@ docker_image:
 fmt:
 - '12.0'
 github_actions_labels:
-- cirun-openstack-gpu-2xlarge
+- cirun-openstack-cpu-xlarge
 is_rc:
 - 'True'
 libabseil:
diff --git a/.ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_version12.9is_rcTrue.yaml b/.ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_version12.9github_actions_labelscirun-openstack-gpu-2xlargeis_rcTrue.yaml
similarity index 100%
rename from .ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_version12.9is_rcTrue.yaml
rename to .ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_version12.9github_actions_labelscirun-openstack-gpu-2xlargeis_rcTrue.yaml
diff --git a/.ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue.yaml b/.ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue.yaml
similarity index 97%
rename from .ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue.yaml
rename to .ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue.yaml
index 1c7ea27a5..48e44edf5 100644
--- a/.ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue.yaml
+++ b/.ci_support/linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue.yaml
@@ -27,7 +27,7 @@ docker_image:
 fmt:
 - '12.0'
 github_actions_labels:
-- cirun-openstack-gpu-2xlarge
+- cirun-openstack-cpu-xlarge
 is_rc:
 - 'True'
 libabseil:
diff --git a/.ci_support/migrations/fmt12_spdlog116.yaml b/.ci_support/migrations/fmt12_spdlog116.yaml
deleted file mode 100644
index 87c31a2ba..000000000
--- a/.ci_support/migrations/fmt12_spdlog116.yaml
+++ /dev/null
@@ -1,10 +0,0 @@
-__migrator:
-  build_number: 1
-  commit_message: Rebuild for fmt 12.0 and spdlog 1.16
-  kind: version
-  migration_number: 1
-migrator_ts: 1760196591.995821
-fmt:
-- '12.0'
-spdlog:
-- '1.16'
diff --git a/.github/workflows/conda-build.yml b/.github/workflows/conda-build.yml
index d3fce2674..e508c9b39 100644
--- a/.github/workflows/conda-build.yml
+++ b/.github/workflows/conda-build.yml
@@ -21,48 +21,45 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - CONFIG: linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9is_rcTrue
-            SHORT_CONFIG: linux_64_blas_implgenericchannel_targets_hc637dd34
+          - CONFIG: linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9github_actions_labelscirun-openstack-gpu-2xlargeis_rcTrue
+            SHORT_CONFIG: linux_64_blas_implgenericchannel_targets_h6680b940
             UPLOAD_PACKAGES: True
             os: ubuntu
-            runs_on: ['cirun-openstack-gpu-2xlarge--${{ github.run_id }}-linux_64_blas_implgenericchannel_targets_hc637dd34', 'linux', 'x64', 'self-hosted']
+            runs_on: ['cirun-openstack-gpu-2xlarge--${{ github.run_id }}-linux_64_blas_implgenericchannel_targets_h6680b940', 'linux', 'x64', 'self-hosted']
             DOCKER_IMAGE: quay.io/condaforge/linux-anvil-x86_64:alma9
             CONDA_FORGE_DOCKER_RUN_ARGS: "--gpus all"
-          - CONFIG: linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue
-            SHORT_CONFIG: linux_64_blas_implgenericchannel_targets_h7548ab25
+          - CONFIG: linux_64_blas_implgenericchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue
+            SHORT_CONFIG: linux_64_blas_implgenericchannel_targets_hddb1fad7
             UPLOAD_PACKAGES: True
             os: ubuntu
-            runs_on: ['cirun-openstack-gpu-2xlarge--${{ github.run_id }}-linux_64_blas_implgenericchannel_targets_h7548ab25', 'linux', 'x64', 'self-hosted']
+            runs_on: ['cirun-openstack-cpu-xlarge--${{ github.run_id }}-linux_64_blas_implgenericchannel_targets_hddb1fad7', 'linux', 'x64', 'self-hosted']
             DOCKER_IMAGE: quay.io/condaforge/linux-anvil-x86_64:alma9
-            CONDA_FORGE_DOCKER_RUN_ARGS: "--gpus all"
-          - CONFIG: linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9is_rcTrue
-            SHORT_CONFIG: linux_64_blas_implmklchannel_targetscond_h2dde49c7
+          - CONFIG: linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_version12.9github_actions_labelscirun-openstack-gpu-2xlargeis_rcTrue
+            SHORT_CONFIG: linux_64_blas_implmklchannel_targetscond_hf0764c09
             UPLOAD_PACKAGES: True
             os: ubuntu
-            runs_on: ['cirun-openstack-gpu-2xlarge--${{ github.run_id }}-linux_64_blas_implmklchannel_targetscond_h2dde49c7', 'linux', 'x64', 'self-hosted']
+            runs_on: ['cirun-openstack-gpu-2xlarge--${{ github.run_id }}-linux_64_blas_implmklchannel_targetscond_hf0764c09', 'linux', 'x64', 'self-hosted']
             DOCKER_IMAGE: quay.io/condaforge/linux-anvil-x86_64:alma9
             CONDA_FORGE_DOCKER_RUN_ARGS: "--gpus all"
-          - CONFIG: linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue
-            SHORT_CONFIG: linux_64_blas_implmklchannel_targetscond_h0aaf175a
+          - CONFIG: linux_64_blas_implmklchannel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue
+            SHORT_CONFIG: linux_64_blas_implmklchannel_targetscond_h0654276e
             UPLOAD_PACKAGES: True
             os: ubuntu
-            runs_on: ['cirun-openstack-gpu-2xlarge--${{ github.run_id }}-linux_64_blas_implmklchannel_targetscond_h0aaf175a', 'linux', 'x64', 'self-hosted']
+            runs_on: ['cirun-openstack-cpu-xlarge--${{ github.run_id }}-linux_64_blas_implmklchannel_targetscond_h0654276e', 'linux', 'x64', 'self-hosted']
             DOCKER_IMAGE: quay.io/condaforge/linux-anvil-x86_64:alma9
-            CONDA_FORGE_DOCKER_RUN_ARGS: "--gpus all"
-          - CONFIG: linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_version12.9is_rcTrue
-            SHORT_CONFIG: linux_aarch64_channel_targetsconda-forge_h562a5d25
+          - CONFIG: linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_version12.9github_actions_labelscirun-openstack-gpu-2xlargeis_rcTrue
+            SHORT_CONFIG: linux_aarch64_channel_targetsconda-forge_hdce6c6a1
             UPLOAD_PACKAGES: True
             os: ubuntu
-            runs_on: ['cirun-openstack-gpu-2xlarge--${{ github.run_id }}-linux_aarch64_channel_targetsconda-forge_h562a5d25', 'linux', 'x64', 'self-hosted']
+            runs_on: ['cirun-openstack-gpu-2xlarge--${{ github.run_id }}-linux_aarch64_channel_targetsconda-forge_hdce6c6a1', 'linux', 'x64', 'self-hosted']
             DOCKER_IMAGE: quay.io/condaforge/linux-anvil-x86_64:alma9
             CONDA_FORGE_DOCKER_RUN_ARGS: "--gpus all"
-          - CONFIG: linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_versionNoneis_rcTrue
-            SHORT_CONFIG: linux_aarch64_channel_targetsconda-forge_he6bea9a8
+          - CONFIG: linux_aarch64_channel_targetsconda-forge_pytorch_rccuda_compiler_versionNonegithub_actions_labelscirun-openstack-cpu-xlargeis_rcTrue
+            SHORT_CONFIG: linux_aarch64_channel_targetsconda-forge_h172dcced
             UPLOAD_PACKAGES: True
             os: ubuntu
-            runs_on: ['cirun-openstack-gpu-2xlarge--${{ github.run_id }}-linux_aarch64_channel_targetsconda-forge_he6bea9a8', 'linux', 'x64', 'self-hosted']
+            runs_on: ['cirun-openstack-cpu-xlarge--${{ github.run_id }}-linux_aarch64_channel_targetsconda-forge_h172dcced', 'linux', 'x64', 'self-hosted']
             DOCKER_IMAGE: quay.io/condaforge/linux-anvil-x86_64:alma9
-            CONDA_FORGE_DOCKER_RUN_ARGS: "--gpus all"
           - CONFIG: osx_64_blas_implgenericchannel_targetsconda-forge_pytorch_rcis_rcTrue
             SHORT_CONFIG: osx_64_blas_implgenericchannel_targetsco_h36e27ba7
             UPLOAD_PACKAGES: True
diff --git a/recipe/bld.bat b/recipe/bld.bat
index c4750dc48..9dfee0bd2 100644
--- a/recipe/bld.bat
+++ b/recipe/bld.bat
@@ -1,6 +1,9 @@
 @echo On
 setlocal enabledelayedexpansion
 
+:: intentional abort
+exit 1
+
 @REM remove pyproject.toml to avoid installing deps from pip
 if EXIST pyproject.toml (
   DEL pyproject.toml
diff --git a/recipe/build.sh b/recipe/build.sh
index dd24fc2d9..ed02c7ed2 100644
--- a/recipe/build.sh
+++ b/recipe/build.sh
@@ -2,6 +2,9 @@
 
 set -ex
 
+# intentional abort
+exit 1
+
 echo "#########################################################################"
 echo "Building ${PKG_NAME} (py: ${PY_VER}) using BLAS implementation $blas_impl"
 echo "#########################################################################"
diff --git a/recipe/conda_build_config.yaml b/recipe/conda_build_config.yaml
index 1ce6c8f1f..0b1161e40 100644
--- a/recipe/conda_build_config.yaml
+++ b/recipe/conda_build_config.yaml
@@ -27,6 +27,7 @@ blas_impl:
 
 # https://github.com/conda-forge/.cirun
 github_actions_labels:
+- cirun-openstack-cpu-xlarge    # [linux]
 - cirun-openstack-gpu-2xlarge   # [linux]
 - cirun-macos-m4-large          # [osx]
 - cirun-azure-windows-4xlarge   # [win]
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index 0767a1287..260fa1f93 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -66,6 +66,10 @@ build:
 {% else %}
   skip: true  # [is_rc]
 {% endif %}
+  # CUDA builds on GPU agents, non-CUDA builds on CPU agents; see above
+  {% if (cuda_compiler_version == "None" and "gpu" in github_actions_labels) or (cuda_compiler_version != "None" and "cpu" in github_actions_labels) %}
+  skip: true
+  {% endif %}
   string: cuda{{ cuda_compiler_version | replace('.', '') }}_{{ blas_impl }}_h{{ PKG_HASH }}_{{ build }}  # [cuda_compiler_version != "None"]
   string: cpu_{{ blas_impl }}_h{{ PKG_HASH }}_{{ build }}                                                 # [cuda_compiler_version == "None"]
   detect_binary_files_with_prefix: false