merge back from earthflowAI fork - #360
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Provision ephemeral HB176rs_v4 JIT builder and tester runners for OpenMPI and MPICH, validate the fixed CPU and NVMe contract, and add fail-closed cleanup and janitor automation. Build Zen 4 TPL images from source with pinned Spack revisions, a source-only mirror, bounded fetch and bootstrap retries, and a shared 176-job build pool. Capture MPI, HDF5, and target evidence; validate candidates offline on fresh runners; promote exact ACR digests; and publish immutable pull instructions. Harden workflow authorization and artifact contracts with Azure OIDC, GitHub App client IDs, Node 24 action pins, trusted sparse checkouts, and credential-free regression fixtures.
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Validate the actual Spack target from spack.lock while treating native compiler flags as the build-tuning evidence. Remove handwritten target tokens from host and candidate validation, keep the lock/native/MPI gates, and add regression coverage for the trusted pull_request_target control path.
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This should contain non-active changes for GEOS-DEV. This supports provisioning examples for Azure.