diff --git a/docs/developer/guides/hpc-cluster-setup.md b/docs/developer/guides/hpc-cluster-setup.md
new file mode 100644
index 00000000..898a1447
--- /dev/null
+++ b/docs/developer/guides/hpc-cluster-setup.md
@@ -0,0 +1,302 @@
+# HPC Cluster Setup
+
+This guide covers installing and running Underworld3 on HPC clusters. Install scripts are maintained in the [uw3-hpc-baremetal-install-run](https://github.com/jcgraciosa/uw3-hpc-baremetal-install-run) repository.
+
+---
+
+## Architecture
+
+All supported clusters use the same architecture:
+
+```
+pixi hpc env  → Python 3.12, sympy, scipy, pint, pydantic, ...  (conda-forge, no MPI)
+cluster MPI   → OpenMPI (spack or module)                        (cluster MPI)
+source build  → mpi4py, PETSc+AMR+petsc4py, h5py                (linked to cluster MPI)
+```
+
+**Why source builds?** Anything linked against MPI must use the same MPI as the cluster scheduler. conda-forge bundles its own MPI (MPICH), which is incompatible with Slurm/PBS. Building from source ensures the correct linkage.
+
+**Why pixi?** Pixi manages the Python environment consistently with local development — same `pixi.toml`, same package versions. The `hpc` environment is pure Python (no MPI packages from conda-forge).
+
+**PETSc build:** `petsc-custom/build-petsc.sh` auto-detects the cluster from hostname, or can be overridden with `UW_CLUSTER=kaiju|gadi`. Cluster-specific differences (HDF5 source, BLAS, cmake, compiler flags) are handled internally.
+
+---
+
+## Kaiju
+
+### Hardware
+
+| Resource | Specification |
+|----------|--------------|
+| Head node | 1× Intel Xeon Silver 4210R, 40 CPUs @ 2.4 GHz |
+| Compute nodes | 8× Intel Xeon Gold 6230R, 104 CPUs @ 2.1 GHz each |
+| Shared storage | `/opt/cluster` via NFS |
+| Scheduler | Slurm with Munge authentication |
+| MPI | Spack `openmpi@4.1.6` |
+
+### Prerequisites
+
+Spack must have OpenMPI available:
+
+```bash
+spack find openmpi
+# openmpi@4.1.6
+```
+
+Pixi must be installed in your user space:
+
+```bash
+pixi --version   # check
+curl -fsSL https://pixi.sh/install.sh | bash   # install if missing
+```
+
+### Installation
+
+Copy `kaiju_install_user.sh` (per-user) or `kaiju_install_shared.sh` (admin) from [uw3-hpc-baremetal-install-run](https://github.com/jcgraciosa/uw3-hpc-baremetal-install-run) to a convenient location, edit the variables at the top, then:
+
+```bash
+source kaiju_install_user.sh install
+```
+
+| Step | Function | Time |
+|------|----------|------|
+| Install pixi | `setup_pixi` | ~1 min |
+| Clone Underworld3 | `clone_uw3` | ~1 min |
+| Install pixi hpc env | `install_pixi_env` | ~3 min |
+| Build mpi4py | `install_mpi4py` | ~2 min |
+| Build PETSc + AMR tools | `install_petsc` | ~1 hour |
+| Build h5py | `install_h5py` | ~2 min |
+| Install Underworld3 | `install_uw3` | ~2 min |
+| Verify | `verify_install` | ~1 min |
+
+Individual steps can be run after sourcing:
+
+```bash
+source kaiju_install_user.sh
+install_petsc   # run just one step
+```
+
+#### What PETSc builds on Kaiju
+
+- **AMR tools**: mmg, parmmg, pragmatic, eigen, bison
+- **Solvers**: mumps, scalapack, slepc
+- **Partitioners**: metis, parmetis, ptscotch
+- **MPI**: Spack's OpenMPI (`--with-mpi-dir`)
+- **HDF5**: downloaded (not in Spack)
+- **BLAS/LAPACK**: fblaslapack (no guaranteed system BLAS on Rocky Linux 8)
+- **cmake**: downloaded (not in Spack)
+- **petsc4py**: built during configure (`--with-petsc4py=1`)
+
+### Activating the Environment
+
+Source the install script at the start of every session or job:
+
+```bash
+source kaiju_install_user.sh
+```
+
+This loads `spack openmpi@4.1.6`, activates the pixi `hpc` environment via `pixi shell-hook`, and sets `PETSC_DIR`, `PETSC_ARCH`, and `PYTHONPATH`.
+
+> `pixi shell-hook` is used instead of `pixi shell` because it activates the environment in the current shell without spawning a new one — required for Slurm batch jobs.
+
+### Running with Slurm
+
+Use `kaiju_slurm_job.sh` from [uw3-hpc-baremetal-install-run](https://github.com/jcgraciosa/uw3-hpc-baremetal-install-run). Edit the variables at the top, then:
+
+```bash
+sbatch kaiju_slurm_job.sh
+```
+
+`--mpi=pmix` is **required** on Kaiju (Spack has `pmix@5.0.3`):
+
+```bash
+srun --mpi=pmix python3 my_model.py
+```
+
+Monitor progress:
+
+```bash
+squeue -u $USER
+tail -f uw3_<jobid>.out
+```
+
+### Shared Installation (Admin)
+
+Deploys to `/opt/cluster/software/underworld3/` so all users access it via Environment Modules:
+
+```bash
+source kaiju_install_shared.sh install
+module load underworld3/development-12Mar26
+```
+
+The shared script adds `fix_permissions()` and `install_modulefile()` on top of the per-user steps. The TCL modulefile hardcodes the Spack OpenMPI and pixi env paths — if Spack is rebuilt (hash changes), update `mpi_root` in `modulefiles/underworld3/development.tcl`.
+
+### Troubleshooting (Kaiju)
+
+#### `import underworld3` fails on compute nodes
+
+Source the install script inside the job script (not the login shell) so all paths propagate to compute nodes. The `kaiju_slurm_job.sh` template does this correctly.
+
+#### PETSc needs rebuilding after Spack module update
+
+PETSc links against Spack's OpenMPI at build time. If `openmpi@4.1.6` is reinstalled:
+
+```bash
+source kaiju_install_user.sh
+rm -rf ~/uw3-installation/underworld3/petsc-custom/petsc
+install_petsc
+install_h5py
+```
+
+#### h5py replaces source-built mpi4py
+
+`pip install h5py` without `--no-deps` silently replaces the source-built mpi4py with a wheel linked to a different MPI. The install script uses `--no-deps` to prevent this. If mpi4py was accidentally replaced:
+
+```bash
+pip install --no-binary :all: --no-cache-dir --force-reinstall "mpi4py>=4,<5"
+```
+
+#### PARMMG configure failure
+
+pixi's conda linker requires transitive shared library dependencies to be explicitly linked. `libmmg.so` built with SCOTCH support causes PARMMG's link test to fail. This is fixed in `build-petsc.sh` by building MMG without SCOTCH (`-DUSE_SCOTCH=OFF`).
+
+---
+
+## Gadi
+
+### Hardware
+
+| Resource | Specification |
+|----------|--------------|
+| System | NCI Gadi (CentOS, Lustre filesystem) |
+| Compute | Multiple node types (normal, hugemem, gpuvolta) |
+| Shared storage | `/g/data` (project quota), `/scratch` (temporary) |
+| Scheduler | PBS Pro |
+| MPI | Module `openmpi/4.1.7` |
+
+### Prerequisites
+
+The following Gadi modules must be available:
+
+```bash
+module load openmpi/4.1.7 hdf5/1.12.2p gmsh/4.13.1 cmake/3.31.6
+```
+
+Pixi must be installed:
+
+```bash
+pixi --version   # check
+curl -fsSL https://pixi.sh/install.sh | bash   # install if missing
+```
+
+> **Inode quota:** Gadi's `/g/data` has strict inode limits. PETSc (which creates many files during build) may need to be built on `/scratch` and symlinked from `/g/data`. The install script handles this if you set `PETSC_DIR` to a `/scratch` path.
+
+### Installation
+
+Copy `gadi_install_user.sh` (per-user) or `gadi_install_shared.sh` (admin) from [uw3-hpc-baremetal-install-run](https://github.com/jcgraciosa/uw3-hpc-baremetal-install-run) to a convenient location, edit the variables at the top, then:
+
+```bash
+source gadi_install_shared.sh install
+```
+
+| Step | Function | Time |
+|------|----------|------|
+| Install pixi | `setup_pixi` | ~1 min |
+| Clone Underworld3 | `clone_uw3` | ~1 min |
+| Install pixi hpc env | `install_pixi_env` | ~3 min |
+| Build mpi4py | `install_mpi4py` | ~2 min |
+| Build PETSc + AMR tools | `install_petsc` | ~1 hour |
+| Build h5py | `install_h5py` | ~2 min |
+| Install Underworld3 | `install_uw3` | ~2 min |
+| Verify | `verify_install` | ~1 min |
+
+#### What PETSc builds on Gadi
+
+- **AMR tools**: mmg, parmmg, pragmatic, eigen
+- **Solvers**: mumps, scalapack, slepc, superlu, superlu_dist, hypre
+- **Partitioners**: metis, parmetis, ptscotch
+- **MPI**: Gadi's OpenMPI module (`--with-cc/cxx/fc`)
+- **HDF5**: Gadi's `hdf5/1.12.2p` module (`--with-hdf5-dir`)
+- **BLAS/LAPACK**: fblaslapack (auto-detection fails due to compiler env manipulation)
+- **petsc4py**: built during configure (`--with-petsc4py=1`)
+
+### Activating the Environment
+
+Source the install script at the start of every session or job:
+
+```bash
+source gadi_install_shared.sh
+```
+
+This loads Gadi modules, activates the pixi `hpc` environment via `pixi shell-hook`, and sets `PETSC_DIR`, `PETSC_ARCH`, and `PYTHONPATH`. Gadi's HDF5 lib dir is prepended to `LD_LIBRARY_PATH` to ensure the parallel HDF5 1.12.2p is loaded at runtime (not conda's serial HDF5 1.14).
+
+### Running with PBS
+
+Use `gadi_pbs_job.sh` from [uw3-hpc-baremetal-install-run](https://github.com/jcgraciosa/uw3-hpc-baremetal-install-run). Edit the variables at the top, then:
+
+```bash
+qsub gadi_pbs_job.sh
+```
+
+Monitor progress:
+
+```bash
+qstat -u $USER
+tail -f <jobid>.o*
+```
+
+### Shared Installation (Admin)
+
+Deploys to `/g/data/m18/software/uw3-pixi/` so all m18 project members can use it:
+
+```bash
+source gadi_install_shared.sh install
+```
+
+The install script is then copied to the install directory so users can source it directly:
+
+```bash
+source /g/data/m18/software/uw3-pixi/gadi_install_shared.sh
+```
+
+### Troubleshooting (Gadi)
+
+#### h5py undefined symbol: H5E_BADATOM_g
+
+The pixi `hpc` env ships a serial HDF5 1.14 (transitive conda-forge dependency). If h5py links against it instead of Gadi's parallel HDF5 1.12.2p, this symbol (removed in 1.14) is missing at runtime. The install script fixes this by temporarily hiding conda's HDF5 during the h5py build so meson can only find Gadi's. If you see this error, re-run:
+
+```bash
+source gadi_install_shared.sh
+install_h5py
+```
+
+#### Compiler interference during PETSc build
+
+The pixi `hpc` env ships a full conda toolchain (`x86_64-conda-linux-gnu-*`) that interferes with Gadi's OpenMPI wrappers. `build-petsc.sh` handles this via `setup_gadi_build_env()`, which unsets conda compiler variables and forces the MPI wrappers to use system compilers (`/usr/bin/gcc`).
+
+#### Fortran MPI library not found
+
+Gadi ships compiler-tagged Fortran MPI libraries (`libmpi_usempif08_GNU.so`) rather than the standard untagged names. `build-petsc.sh` creates symlinks in `petsc-custom/mpi-gadi-gnu-libs/` to bridge this.
+
+#### `import underworld3` fails in PBS job
+
+Ensure the install script is sourced inside the job script (not just in the login shell). The `gadi_pbs_job.sh` template does this correctly.
+
+---
+
+## Rebuilding Underworld3 after source changes
+
+```bash
+source kaiju_install_user.sh   # or gadi_install_shared.sh
+cd <UW3_PATH>
+git pull
+pip install -e .
+```
+
+---
+
+## Related
+
+- [Development Setup](development-setup.md) — local development with pixi
+- [Branching Strategy](branching-strategy.md) — git workflow
+- [Parallel Computing](../../advanced/parallel-computing.md) — writing parallel-safe UW3 code
diff --git a/docs/developer/index.md b/docs/developer/index.md
index 823ff7a2..faff147f 100644
--- a/docs/developer/index.md
+++ b/docs/developer/index.md
@@ -114,6 +114,7 @@ guides/SPELLING_CONVENTION
 guides/version-management
 guides/branching-strategy
 guides/BINDER_CONTAINER_SETUP
+guides/kaiju-cluster-setup
 ```
 
 ```{toctree}
diff --git a/petsc-custom/build-petsc.sh b/petsc-custom/build-petsc.sh
index 135c9aac..c18f2409 100755
--- a/petsc-custom/build-petsc.sh
+++ b/petsc-custom/build-petsc.sh
@@ -2,26 +2,34 @@
 #
 # Build PETSc with adaptive mesh refinement (AMR) tools
 #
-# This script builds a custom PETSc installation with:
-# - pragmatic: anisotropic mesh adaptation
-# - mmg: surface/volume mesh adaptation
-# - parmmg: parallel mesh adaptation
-# - slepc: eigenvalue solvers
-# - mumps: direct solver
+# Supports three build targets, auto-detected from hostname or UW_CLUSTER env var:
+#   local  — macOS/Linux developer machine (pixi env for MPI and HDF5)
+#   kaiju  — Kaiju cluster (Rocky Linux 8, Spack OpenMPI, no system HDF5/cmake/BLAS)
+#   gadi   — NCI Gadi (CentOS, module OpenMPI + HDF5, PBS Pro)
 #
-# MPI is auto-detected from the active pixi environment:
-# - MPICH  → PETSC_ARCH = petsc-4-uw-mpich
-# - OpenMPI → PETSC_ARCH = petsc-4-uw-openmpi
+# Cluster-specific differences:
 #
-# Both builds co-exist under the same PETSc source tree.
-# Build time: ~1 hour on Apple Silicon
+#   Aspect        local                    kaiju             gadi
+#   PETSC_ARCH    petsc-4-uw-{mpich,       petsc-4-uw        arch-linux-c-opt
+#                   openmpi}
+#   MPI           pixi env                 spack (PATH)      module (PATH)
+#   HDF5          pixi env                 download          module ($HDF5_DIR)
+#   BLAS/LAPACK   auto                     download          download (auto fails)
+#   cmake         pixi env                 download          module
+#   bison         download                 download          system
+#   petsc4py      separate step            with-petsc4py=1   with-petsc4py=1
+#   extra flags   —                        —                 superlu, hypre, ...
+#
+# Override auto-detection: export UW_CLUSTER=local|kaiju|gadi
 #
 # Usage:
-#   ./build-petsc.sh          # Full build (clone, configure, build)
+#   ./build-petsc.sh           # Full build (clone, patch, configure, build)
 #   ./build-petsc.sh configure # Just reconfigure
 #   ./build-petsc.sh build     # Just build (after configure)
-#   ./build-petsc.sh petsc4py  # Just build petsc4py
-#   ./build-petsc.sh clean     # Remove build for detected MPI
+#   ./build-petsc.sh petsc4py  # Build petsc4py separately (local only)
+#   ./build-petsc.sh patch     # Apply UW3 patches
+#   ./build-petsc.sh test      # Run PETSc tests
+#   ./build-petsc.sh clean     # Remove build for current arch
 #   ./build-petsc.sh clean-all # Remove entire PETSc directory
 #   ./build-petsc.sh help      # Show this help
 #
@@ -30,64 +38,180 @@ set -e
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 PETSC_DIR="${SCRIPT_DIR}/petsc"
 
-# Detect active pixi environment (robust)
-if [ -z "$PIXI_PROJECT_ROOT" ]; then
-    echo "Error: This script must be run from within a pixi environment"
-    echo "Use: pixi run -e <env> ./build-petsc.sh"
-    exit 1
-fi
+# ── Cluster detection ─────────────────────────────────────────────────────────
+detect_cluster() {
+    if [ -n "${UW_CLUSTER}" ]; then
+        echo "${UW_CLUSTER}"; return
+    fi
+    local hn
+    hn="$(hostname -f 2>/dev/null || hostname)"
+    case "${hn}" in
+        *.gadi.nci.org.au|gadi-*) echo "gadi" ;;
+        kaiju*)                    echo "kaiju" ;;
+        *)                         echo "local" ;;
+    esac
+}
+
+CLUSTER="$(detect_cluster)"
 
-PIXI_ENV="$(python3 - <<'EOF'
+# ── Cluster-specific configuration ───────────────────────────────────────────
+# Sets PETSC_ARCH, MPI_IMPL, and cluster-specific variables (PIXI_ENV, MPI_DIR,
+# HDF5_DIR). Also validates that the required environment is active.
+
+case "${CLUSTER}" in
+    local)
+        if [ -z "$PIXI_PROJECT_ROOT" ]; then
+            echo "Error: This script must be run from within a pixi environment"
+            echo "Use: pixi run -e <env> ./build-petsc.sh"
+            exit 1
+        fi
+
+        PIXI_ENV="$(python3 - <<'EOF'
 import sys, pathlib
 print(pathlib.Path(sys.executable).resolve().parents[1])
 EOF
 )"
 
-# ── MPI auto-detection ──────────────────────────────────────────────
-# Detect which MPI implementation is available in the pixi environment.
-# Sets MPI_IMPL ("mpich" or "openmpi") and PETSC_ARCH accordingly.
+        _detect_local_mpi() {
+            local mpi_version
+            mpi_version=$(python3 -c "from mpi4py import MPI; print(MPI.Get_library_version())" 2>/dev/null || echo "")
+            if echo "$mpi_version" | grep -qi "open mpi"; then
+                echo "openmpi"
+            elif echo "$mpi_version" | grep -qi "mpich"; then
+                echo "mpich"
+            else
+                local mpicc_out
+                mpicc_out=$("$PIXI_ENV/bin/mpicc" --version 2>&1 || echo "")
+                if echo "$mpicc_out" | grep -qi "open mpi"; then
+                    echo "openmpi"
+                else
+                    echo "mpich"
+                fi
+            fi
+        }
 
-detect_mpi() {
-    local mpi_version
-    mpi_version=$(python3 -c "from mpi4py import MPI; print(MPI.Get_library_version())" 2>/dev/null || echo "")
+        MPI_IMPL=$(_detect_local_mpi)
+        PETSC_ARCH="petsc-4-uw-${MPI_IMPL}"
+        ;;
 
-    if echo "$mpi_version" | grep -qi "open mpi"; then
-        echo "openmpi"
-    elif echo "$mpi_version" | grep -qi "mpich"; then
-        echo "mpich"
-    else
-        # Fallback: check for mpicc --version
-        local mpicc_out
-        mpicc_out=$("$PIXI_ENV/bin/mpicc" --version 2>&1 || echo "")
-        if echo "$mpicc_out" | grep -qi "open mpi"; then
-            echo "openmpi"
-        else
-            echo "mpich"  # default fallback
+    kaiju)
+        if ! command -v mpicc &>/dev/null; then
+            echo "Error: mpicc not found. Load spack OpenMPI first:"
+            echo "  spack load openmpi@4.1.6"
+            exit 1
         fi
-    fi
-}
+        if ! echo "${PATH}" | tr ':' '\n' | grep -q "\.pixi/envs/hpc/bin"; then
+            echo "Error: must be run inside the pixi hpc environment"
+            echo "  source kaiju_install_user.sh   (activates env via pixi shell-hook)"
+            exit 1
+        fi
+        MPI_DIR="$(dirname "$(dirname "$(which mpicc)")")"
+        MPI_IMPL="openmpi"
+        PETSC_ARCH="petsc-4-uw"
+        ;;
 
-MPI_IMPL=$(detect_mpi)
-PETSC_ARCH="petsc-4-uw-${MPI_IMPL}"
+    gadi)
+        if ! command -v mpicc &>/dev/null; then
+            echo "Error: mpicc not found. Load Gadi OpenMPI module first:"
+            echo "  module load openmpi/4.1.7"
+            exit 1
+        fi
+        if [ -z "${HDF5_DIR}" ]; then
+            echo "Error: HDF5_DIR is not set. Load Gadi HDF5 module first:"
+            echo "  module load hdf5/1.12.2p"
+            exit 1
+        fi
+        if ! echo "${PATH}" | tr ':' '\n' | grep -q "\.pixi/envs/hpc/bin"; then
+            echo "Error: must be run inside the pixi hpc environment"
+            echo "  source gadi_install_shared.sh   (activates env via pixi shell-hook)"
+            exit 1
+        fi
+        MPI_DIR="$(dirname "$(dirname "$(which mpicc)")")"
+        MPI_IMPL="openmpi"
+        PETSC_ARCH="arch-linux-c-opt"
+        ;;
+
+    *)
+        echo "Unknown cluster: ${CLUSTER}"
+        echo "Set UW_CLUSTER=local|kaiju|gadi to override auto-detection"
+        exit 1
+        ;;
+esac
 
 echo "=========================================="
 echo "PETSc AMR Build Script"
 echo "=========================================="
-echo "PETSC_DIR:  $PETSC_DIR"
-echo "PETSC_ARCH: $PETSC_ARCH"
-echo "MPI:        $MPI_IMPL"
-echo "PIXI_ENV:   $PIXI_ENV"
+echo "CLUSTER:    ${CLUSTER}"
+echo "PETSC_DIR:  ${PETSC_DIR}"
+echo "PETSC_ARCH: ${PETSC_ARCH}"
+echo "MPI:        ${MPI_IMPL}"
+if [ "${CLUSTER}" = "local" ]; then
+    echo "PIXI_ENV:   ${PIXI_ENV}"
+else
+    echo "MPI_DIR:    ${MPI_DIR}"
+fi
+[ "${CLUSTER}" = "gadi" ] && echo "HDF5_DIR:   ${HDF5_DIR}"
 echo "=========================================="
 
+# ── Gadi-specific: build environment setup ───────────────────────────────────
+# Handles compiler-tagged Fortran MPI libs and conda toolchain interference.
+# Must be called before any compile/link step on Gadi.
+setup_gadi_build_env() {
+    if [ -z "${MPI_DIR}" ]; then
+        echo "Error: MPI_DIR is not set. Source gadi_install_shared.sh first."
+        exit 1
+    fi
+
+    # Create symlinks for Gadi's compiler-tagged Fortran MPI libs.
+    # mpifort --showme refers to libmpi_usempif08 etc. (no compiler tag),
+    # but Gadi only ships _GNU, _Intel, _nvidia variants.
+    local _mpi_gnu_dir="${SCRIPT_DIR}/mpi-gadi-gnu-libs"
+    mkdir -p "${_mpi_gnu_dir}"
+    for _lib in usempif08 usempi_ignore_tkr mpifh; do
+        [ ! -f "${_mpi_gnu_dir}/libmpi_${_lib}.so" ] && \
+            ln -sf "${MPI_DIR}/lib/libmpi_${_lib}_GNU.so" "${_mpi_gnu_dir}/libmpi_${_lib}.so"
+    done
+
+    # LD_LIBRARY_PATH = runtime search path (dynamic loader)
+    # LIBRARY_PATH    = link-time search path (ld resolves -lmpi_usempif08 etc.)
+    export LD_LIBRARY_PATH="${_mpi_gnu_dir}:${MPI_DIR}/lib:/apps/ucc/1.3.0/lib:/usr/lib64:${LD_LIBRARY_PATH}"
+    export LIBRARY_PATH="${_mpi_gnu_dir}:${LIBRARY_PATH}"
+
+    # Unset conda/pixi compiler vars that interfere with OpenMPI wrappers.
+    # The pixi hpc env ships a full conda toolchain (x86_64-conda-linux-gnu-*)
+    # that conflicts with system compilers required by Gadi's OpenMPI.
+    unset CC CXX FC F77 F90 CPP AR RANLIB
+    unset CFLAGS CXXFLAGS FFLAGS CPPFLAGS LDFLAGS
+
+    # Force MPI wrappers to use system compilers, not conda's gcc
+    export OMPI_CC=/usr/bin/gcc
+    export OMPI_CXX=/usr/bin/g++
+    export OMPI_FC=/usr/bin/gfortran
+    # Gadi puts Fortran MPI headers in a compiler-tagged subdirectory (include/GNU/)
+    export OMPI_FCFLAGS="-I${MPI_DIR}/include/GNU"
+
+    # Put system bin dirs first so the system linker (/usr/bin/ld) wins over
+    # conda's ld — conda's ld cannot find Gadi-specific libs (hcoll, ucc, libnl).
+    export PATH="/usr/bin:/usr/local/bin:${MPI_DIR}/bin:${PATH}"
+}
+
 clone_petsc() {
-    if [ -d "$PETSC_DIR" ]; then
+    # For Gadi: resolve symlink before cloning. git clone replaces a
+    # symlink-to-empty-dir with a real directory, defeating the
+    # gdata→scratch symlink approach used to avoid inode quota limits.
+    local _clone_target="${PETSC_DIR}"
+    if [ "${CLUSTER}" = "gadi" ] && [ -L "${PETSC_DIR}" ]; then
+        _clone_target="$(readlink -f "${PETSC_DIR}")"
+    fi
+
+    if [ -f "${_clone_target}/configure" ]; then
         echo "PETSc directory already exists. Skipping clone."
-        echo "To force fresh clone, run: ./build-petsc.sh clean-all"
+        echo "To force fresh clone, run: $0 clean-all"
         return 0
     fi
 
     echo "Cloning PETSc release branch..."
-    git clone -b release https://gitlab.com/petsc/petsc.git "$PETSC_DIR"
+    git clone -b release https://gitlab.com/petsc/petsc.git "${_clone_target}"
     echo "Clone complete."
 }
 
@@ -112,49 +236,100 @@ apply_patches() {
 }
 
 configure_petsc() {
-    echo "Configuring PETSc with AMR tools ($MPI_IMPL)..."
+    echo "Configuring PETSc with AMR tools (${CLUSTER})..."
     cd "$PETSC_DIR"
 
-    # Configure with adaptive mesh refinement tools
-    # Downloads: bison, eigen, metis, mmg, mumps, parmetis, parmmg,
-    #            pragmatic, ptscotch, scalapack, slepc
-    # Uses system: MPI (from pixi), HDF5 (from pixi)
-    python3 ./configure \
-        --with-petsc-arch="$PETSC_ARCH" \
-        --download-bison \
-        --download-eigen \
-        --download-metis \
-        --download-mmg \
-        --download-mumps \
-        --download-parmetis \
-        --download-parmmg \
-        --download-pragmatic \
-        --download-ptscotch="${SCRIPT_DIR}/patches/scotch-7.0.10-c23-fix.tar.gz" \
-        --download-scalapack \
-        --download-slepc \
-        --with-debugging=0 \
-        --with-hdf5=1 \
-        --with-pragmatic=1 \
-        --with-x=0 \
-        --with-mpi-dir="$PIXI_ENV" \
-        --with-hdf5-dir="$PIXI_ENV" \
-        --download-hdf5=0 \
-        --download-mpich=0 \
-        --download-openmpi=0 \
-        --download-mpi4py=0 \
-        --with-petsc4py=0
+    # Capture pixi's python3 BEFORE setup_gadi_build_env reorders PATH.
+    local _python="python3"
+    if [ "${CLUSTER}" = "gadi" ]; then
+        _python="$(which python3)"
+        setup_gadi_build_env
+    fi
+
+    # Flags shared across all clusters.
+    # Downloads and builds:
+    #   AMR:          mmg, parmmg, pragmatic, eigen
+    #   Solvers:      mumps, scalapack, slepc
+    #   Partitioners: metis, parmetis, ptscotch (patched for C23)
+    # Uses pixi env (local):  MPI (amr/amr-mpich/amr-openmpi), HDF5
+    # Downloads (kaiju):      HDF5, BLAS/LAPACK, cmake, bison
+    # Uses module (gadi):     MPI (openmpi/4.1.7), HDF5 ($HDF5_DIR)
+    local -a _common=(
+        --with-petsc-arch="${PETSC_ARCH}"
+        --with-debugging=0
+        --with-pragmatic=1
+        --with-x=0
+        --download-eigen=1
+        --download-metis=1
+        --download-mmg=1
+        "--download-mmg-cmake-arguments=-DMMG_INSTALL_PRIVATE_HEADERS=ON -DUSE_SCOTCH=OFF"
+        --download-mumps=1
+        --download-parmetis=1
+        --download-parmmg=1
+        --download-pragmatic=1
+        "--download-ptscotch=${SCRIPT_DIR}/patches/scotch-7.0.10-c23-fix.tar.gz"
+        --download-scalapack=1
+        --download-slepc=1
+    )
+
+    case "${CLUSTER}" in
+        local)
+            "${_python}" ./configure "${_common[@]}" \
+                --with-mpi-dir="${PIXI_ENV}" \
+                --with-hdf5=1 \
+                --with-hdf5-dir="${PIXI_ENV}" \
+                --download-hdf5=0 \
+                --download-mpich=0 \
+                --download-openmpi=0 \
+                --download-mpi4py=0 \
+                --download-bison \
+                --with-petsc4py=0
+            ;;
+        kaiju)
+            "${_python}" ./configure "${_common[@]}" \
+                --with-mpi-dir="${MPI_DIR}" \
+                --download-hdf5=1 \
+                --download-fblaslapack=1 \
+                --download-cmake=1 \
+                --download-bison=1 \
+                --with-petsc4py=1 \
+                --with-make-np=40
+            ;;
+        gadi)
+            "${_python}" ./configure "${_common[@]}" \
+                --with-cc="${MPI_DIR}/bin/mpicc" \
+                --with-cxx="${MPI_DIR}/bin/mpicxx" \
+                --with-fc="${MPI_DIR}/bin/mpifort" \
+                --with-hdf5=1 \
+                --with-hdf5-dir="${HDF5_DIR}" \
+                --download-fblaslapack=1 \
+                --with-petsc4py=1 \
+                --with-make-np=40 \
+                --with-shared-libraries=1 \
+                --with-cxx-dialect=C++11 \
+                "--COPTFLAGS=-g -O3" "--CXXOPTFLAGS=-g -O3" "--FOPTFLAGS=-g -O3" \
+                --useThreads=0 \
+                --download-zlib=1 \
+                --download-superlu=1 \
+                --download-superlu_dist=1 \
+                --download-hypre=1 \
+                --download-ctetgen=1 \
+                --download-triangle=1
+            ;;
+    esac
 
     echo "Configure complete."
 }
 
 build_petsc() {
-    echo "Building PETSc ($MPI_IMPL)..."
+    echo "Building PETSc (${CLUSTER})..."
     cd "$PETSC_DIR"
 
-    # Set environment for build
     export PETSC_DIR
     export PETSC_ARCH
 
+    [ "${CLUSTER}" = "gadi" ] && setup_gadi_build_env
+
     make all
     echo "PETSc build complete."
 }
@@ -166,12 +341,19 @@ test_petsc() {
     export PETSC_DIR
     export PETSC_ARCH
 
+    [ "${CLUSTER}" = "gadi" ] && setup_gadi_build_env
+
     make check
     echo "PETSc tests complete."
 }
 
 build_petsc4py() {
-    echo "Building petsc4py ($MPI_IMPL)..."
+    if [ "${CLUSTER}" != "local" ]; then
+        echo "Note: petsc4py is built during configure on HPC clusters (--with-petsc4py=1). Skipping."
+        return 0
+    fi
+
+    echo "Building petsc4py..."
     cd "$PETSC_DIR/src/binding/petsc4py"
 
     export PETSC_DIR
@@ -183,9 +365,8 @@ build_petsc4py() {
 }
 
 clean_petsc() {
-    # Clean just the arch-specific build
     local arch_dir="$PETSC_DIR/$PETSC_ARCH"
-    echo "Removing PETSc build for $MPI_IMPL ($arch_dir)..."
+    echo "Removing PETSc build for $PETSC_ARCH ($arch_dir)..."
     if [ -d "$arch_dir" ]; then
         rm -rf "$arch_dir"
         echo "Cleaned $PETSC_ARCH."
@@ -207,69 +388,58 @@ clean_all() {
 show_help() {
     echo "Usage: $0 [command]"
     echo ""
-    echo "MPI auto-detected from pixi environment: $MPI_IMPL"
-    echo "PETSC_ARCH: $PETSC_ARCH"
+    echo "Cluster: ${CLUSTER}  (override: export UW_CLUSTER=local|kaiju|gadi)"
+    echo "PETSC_ARCH: ${PETSC_ARCH}"
     echo ""
     echo "Commands:"
-    echo "  (none)    Full build: clone, configure, build, petsc4py"
+    echo "  (none)    Full build: clone, patch, configure, build"
+    [ "${CLUSTER}" = "local" ] && echo "            (local: also runs petsc4py separately)"
     echo "  clone     Clone PETSc repository"
+    echo "  patch     Apply UW3 patches to PETSc source"
     echo "  configure Configure PETSc with AMR tools"
     echo "  build     Build PETSc"
     echo "  test      Run PETSc tests"
-    echo "  petsc4py  Build and install petsc4py"
-    echo "  patch     Apply UW3 patches to PETSc source"
-    echo "  clean     Remove build for current MPI ($PETSC_ARCH)"
-    echo "  clean-all Remove entire PETSc directory (all MPI builds)"
+    echo "  petsc4py  Build and install petsc4py (local only)"
+    echo "  clean     Remove build for current arch (${PETSC_ARCH})"
+    echo "  clean-all Remove entire PETSc directory (all builds)"
     echo "  help      Show this help"
-    echo ""
-    echo "MPICH and OpenMPI builds co-exist. To build both:"
-    echo "  pixi run -e amr         ./petsc-custom/build-petsc.sh"
-    echo "  pixi run -e amr-openmpi ./petsc-custom/build-petsc.sh"
+    if [ "${CLUSTER}" = "local" ]; then
+        echo ""
+        echo "MPICH and OpenMPI builds co-exist. To build both:"
+        echo "  pixi run -e amr         ./petsc-custom/build-petsc.sh"
+        echo "  pixi run -e amr-openmpi ./petsc-custom/build-petsc.sh"
+    fi
 }
 
-# Main entry point
+# ── Main entry point ──────────────────────────────────────────────────────────
 case "${1:-all}" in
     all)
         clone_petsc
         apply_patches
         configure_petsc
         build_petsc
-        build_petsc4py
+        if [ "${CLUSTER}" = "local" ]; then
+            build_petsc4py
+        fi
         echo ""
         echo "=========================================="
-        echo "PETSc AMR build complete! ($MPI_IMPL)"
-        echo "Set these environment variables:"
-        echo "  export PETSC_DIR=$PETSC_DIR"
-        echo "  export PETSC_ARCH=$PETSC_ARCH"
+        echo "PETSc AMR build complete! (${CLUSTER}, ${MPI_IMPL})"
+        echo "  PETSC_DIR=${PETSC_DIR}"
+        echo "  PETSC_ARCH=${PETSC_ARCH}"
+        if [ "${CLUSTER}" != "local" ]; then
+            echo "  export PYTHONPATH=\$PETSC_DIR/\$PETSC_ARCH/lib:\$PYTHONPATH"
+        fi
         echo "=========================================="
         ;;
-    clone)
-        clone_petsc
-        ;;
-    configure)
-        configure_petsc
-        ;;
-    build)
-        build_petsc
-        ;;
-    patch)
-        apply_patches
-        ;;
-    test)
-        test_petsc
-        ;;
-    petsc4py)
-        build_petsc4py
-        ;;
-    clean)
-        clean_petsc
-        ;;
-    clean-all)
-        clean_all
-        ;;
-    help|--help|-h)
-        show_help
-        ;;
+    clone)     clone_petsc ;;
+    patch)     apply_patches ;;
+    configure) configure_petsc ;;
+    build)     build_petsc ;;
+    test)      test_petsc ;;
+    petsc4py)  build_petsc4py ;;
+    clean)     clean_petsc ;;
+    clean-all) clean_all ;;
+    help|--help|-h) show_help ;;
     *)
         echo "Unknown command: $1"
         show_help
diff --git a/pixi.lock b/pixi.lock
index 00800d32..ffd0bc62 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -7606,6 +7606,342 @@ environments:
       - pypi: https://files.pythonhosted.org/packages/6e/67/9d4ac4b0d683aaa4170da59a1980740b281fd38fc253e1830fde4dac3d4f/pygmsh-7.1.17-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/b1/09/0ab0853d6d634455fe70d90a306162160ead7592eceaca194168a16d3beb/sphinx_math_dollar-1.3-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/03/46/25d64bcd7821c8d6f1080e1c43d5fcdfc442a18f759a230b5ccdc891093e/sphinxcontrib_mermaid-2.0.1-py3-none-any.whl
+  hpc:
+    channels:
+    - url: https://conda.anaconda.org/conda-forge/
+    indexes:
+    - https://pypi.org/simple
+    options:
+      pypi-prerelease-mode: if-necessary-or-explicit
+    packages:
+      linux-64:
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-20_gnu.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/_python_abi3_support-1.0-hd8ed1ab_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/alabaster-1.0.0-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.15.3-hb03c661_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/annotated-types-0.7.0-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/anyio-4.12.1-pyhcf101f3_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/argon2-cffi-25.1.0-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/argon2-cffi-bindings-25.1.0-py312h4c3975b_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/arrow-1.4.0-pyhcf101f3_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/asttokens-3.0.1-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/attrs-26.1.0-pyhcf101f3_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/babel-2.18.0-pyhcf101f3_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/backports.zstd-1.3.0-py312h90b7ffd_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/beautifulsoup4-4.14.3-pyha770c72_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/binutils-2.45.1-default_h4852527_102.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/binutils_impl_linux-64-2.45.1-default_hfdba357_102.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/binutils_linux-64-2.45.1-default_h4852527_102.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/bleach-6.3.0-pyhcf101f3_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/bleach-with-css-6.3.0-hbca2aae_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/blosc-1.21.6-he440d0b_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/brotli-1.2.0-hed03a55_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/brotli-bin-1.2.0-hb03c661_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.2.0-py312hdb49522_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-hda65f42_9.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.34.6-hb03c661_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/c-compiler-1.11.0-h4d9bdce_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.2.25-hbd8a1cb_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/cached-property-1.5.2-hd8ed1ab_1.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/noarch/cached_property-1.5.2-pyha770c72_1.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/cairo-1.18.4-he90730b_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/certifi-2026.2.25-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/cffi-2.0.0-py312h460c074_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/cftime-1.6.5-py312h4f23490_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.6-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/comm-0.2.3-pyhe01879c_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/compilers-1.11.0-ha770c72_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/conda-gcc-specs-14.3.0-he8ccf15_18.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/contourpy-1.3.3-py312h0a2e395_4.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/cpython-3.12.13-py312hd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/cxx-compiler-1.11.0-hfcd1e18_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/cycler-0.12.1-pyhcf101f3_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/cyrus-sasl-2.1.28-hac629b4_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/cython-3.2.4-py312h68e6be4_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/dbus-1.16.2-h24cb091_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/debugpy-1.8.20-py312h8285ef7_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/decorator-5.2.1-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/defusedxml-0.7.1-pyhd8ed1ab_0.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/noarch/docutils-0.21.2-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/double-conversion-3.4.0-hecca717_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/exceptiongroup-1.3.1-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/execnet-2.1.2-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/executing-2.2.1-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/flexcache-0.3-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/flexparser-0.4-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/noarch/font-ttf-inconsolata-3.000-h77eed37_0.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/noarch/font-ttf-source-code-pro-2.038-h77eed37_0.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/noarch/font-ttf-ubuntu-0.83-h77eed37_3.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/fontconfig-2.17.1-h27c8c51_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/fonts-conda-ecosystem-1-0.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/noarch/fonts-conda-forge-1-hc364b38_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/fonttools-4.62.0-py312h8a5da7c_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/fortran-compiler-1.11.0-h9bea470_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/fqdn-1.5.1-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/freetype-2.14.2-ha770c72_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gcc-14.3.0-h0dff253_18.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gcc_impl_linux-64-14.3.0-hbdf3cc3_18.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gcc_linux-64-14.3.0-h298d278_21.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gfortran-14.3.0-h76987e4_18.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gfortran_impl_linux-64-14.3.0-h1a219da_18.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gfortran_linux-64-14.3.0-hfa02b96_21.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gmp-6.3.0-hac33072_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gmpy2-2.3.0-py312hcaba1f9_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/graphite2-1.3.14-hecca717_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gxx-14.3.0-h76987e4_18.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gxx_impl_linux-64-14.3.0-h2185e75_18.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/gxx_linux-64-14.3.0-he467f4b_21.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/h2-4.3.0-pyhcf101f3_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/h5py-3.15.1-nompi_py312ha4f8f14_101.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/harfbuzz-13.2.0-h6083320_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/hdf4-4.2.15-h2a13503_7.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/hdf5-1.14.6-nompi_h19486de_106.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/hpack-4.1.0-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/hyperframe-6.1.0-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/icu-78.3-h33c6efd_0.conda
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   timestamp: 1772121854618
+- conda: https://conda.anaconda.org/conda-forge/linux-64/qt6-main-6.10.2-pl5321h16c4a6b_6.conda
+  sha256: dd2fdde2cfecd29d4acd2bacbb341f00500d8b3b1c0583a8d92e07fc1e4b1106
+  md5: 3a00bff44c15ee37bfd5eb435e1b2a51
+  depends:
+  - libxcb
+  - xcb-util
+  - xcb-util-wm
+  - xcb-util-keysyms
+  - xcb-util-image
+  - xcb-util-renderutil
+  - xcb-util-cursor
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=14
+  - libstdcxx >=14
+  - xorg-libice >=1.1.2,<2.0a0
+  - icu >=78.3,<79.0a0
+  - libllvm22 >=22.1.0,<22.2.0a0
+  - krb5 >=1.22.2,<1.23.0a0
+  - xorg-libx11 >=1.8.13,<2.0a0
+  - xorg-libxtst >=1.2.5,<2.0a0
+  - libfreetype >=2.14.2
+  - libfreetype6 >=2.14.2
+  - libxml2
+  - libxml2-16 >=2.14.6
+  - libtiff >=4.7.1,<4.8.0a0
+  - libegl >=1.7.0,<2.0a0
+  - xorg-libxxf86vm >=1.1.7,<2.0a0
+  - libdrm >=2.4.125,<2.5.0a0
+  - xcb-util >=0.4.1,<0.5.0a0
+  - libbrotlicommon >=1.2.0,<1.3.0a0
+  - libbrotlienc >=1.2.0,<1.3.0a0
+  - libbrotlidec >=1.2.0,<1.3.0a0
+  - libvulkan-loader >=1.4.341.0,<2.0a0
+  - libclang-cpp22.1 >=22.1.0,<22.2.0a0
+  - double-conversion >=3.4.0,<3.5.0a0
+  - dbus >=1.16.2,<2.0a0
+  - xcb-util-renderutil >=0.3.10,<0.4.0a0
+  - alsa-lib >=1.2.15.3,<1.3.0a0
+  - wayland >=1.24.0,<2.0a0
+  - xcb-util-cursor >=0.1.6,<0.2.0a0
+  - libpng >=1.6.55,<1.7.0a0
+  - libclang13 >=22.1.0
+  - libwebp-base >=1.6.0,<2.0a0
+  - zstd >=1.5.7,<1.6.0a0
+  - pcre2 >=10.47,<10.48.0a0
+  - xorg-libxrandr >=1.5.5,<2.0a0
+  - libcups >=2.3.3,<2.4.0a0
+  - libpq >=18.3,<19.0a0
+  - libjpeg-turbo >=3.1.2,<4.0a0
+  - xorg-libxcomposite >=0.4.7,<1.0a0
+  - xcb-util-keysyms >=0.4.1,<0.5.0a0
+  - xorg-libxcursor >=1.2.3,<2.0a0
+  - harfbuzz >=13.1.1
+  - openssl >=3.5.5,<4.0a0
+  - fontconfig >=2.17.1,<3.0a0
+  - fonts-conda-ecosystem
+  - libxcb >=1.17.0,<2.0a0
+  - libzlib >=1.3.1,<2.0a0
+  - libsqlite >=3.52.0,<4.0a0
+  - xorg-libsm >=1.2.6,<2.0a0
+  - libgl >=1.7.0,<2.0a0
+  - libglib >=2.86.4,<3.0a0
+  - xorg-libxext >=1.3.7,<2.0a0
+  - libxkbcommon >=1.13.1,<2.0a0
+  - xorg-libxdamage >=1.1.6,<2.0a0
+  - xcb-util-image >=0.4.0,<0.5.0a0
+  - xcb-util-wm >=0.4.2,<0.5.0a0
+  constrains:
+  - qt ==6.10.2
+  license: LGPL-3.0-only
+  license_family: LGPL
+  purls: []
+  size: 58118322
+  timestamp: 1773865930316
 - conda: https://conda.anaconda.org/conda-forge/osx-arm64/qt6-main-6.10.1-h478b344_2.conda
   sha256: b489baadcdb702f14e453a3fe3c22af782e374c2f4e4b9d6e1ab540d029681c7
   md5: 7440806d0eb80dccd17cb3c67593ac72
@@ -28457,6 +29275,20 @@ packages:
   purls: []
   size: 329779
   timestamp: 1761174273487
+- conda: https://conda.anaconda.org/conda-forge/linux-64/wayland-1.25.0-hd6090a7_0.conda
+  sha256: ea374d57a8fcda281a0a89af0ee49a2c2e99cc4ac97cf2e2db7064e74e764bdb
+  md5: 996583ea9c796e5b915f7d7580b51ea6
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libexpat >=2.7.4,<3.0a0
+  - libffi >=3.5.2,<3.6.0a0
+  - libgcc >=14
+  - libstdcxx >=14
+  license: MIT
+  license_family: MIT
+  purls: []
+  size: 334139
+  timestamp: 1773959575393
 - conda: https://conda.anaconda.org/conda-forge/noarch/wayland-protocols-1.47-hd8ed1ab_0.conda
   sha256: 9ab2c12053ea8984228dd573114ffc6d63df42c501d59fda3bf3aeb1eaa1d23e
   md5: 7da1571f560d4ba3343f7f4c48a79c76
diff --git a/pixi.toml b/pixi.toml
index 26c7b8d7..fee1757f 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -229,6 +229,24 @@ PETSC_ARCH = "petsc-4-uw-openmpi"
 petsc-local-build = { cmd = "./build-petsc.sh", cwd = "petsc-custom" }
 petsc-local-clean = { cmd = "./build-petsc.sh clean", cwd = "petsc-custom" }
 
+# ============================================
+# HPC CLUSTER FEATURE
+# ============================================
+# For HPC clusters (Kaiju, Gadi, etc.) running linux-64.
+# Pure Python only — base dependencies cover all pure-Python needs.
+# mpi4py, h5py, petsc, petsc4py are built from source against the
+# cluster's MPI using petsc-custom/build-petsc.sh (UW_CLUSTER auto-detected).
+# See: docs/developer/guides/kaiju-cluster-setup.md
+
+[feature.hpc]
+platforms = ["linux-64"]
+
+[feature.hpc.dependencies]
+# patchelf is needed on Gadi to fix h5py RPATH order after source build:
+# meson embeds the conda env lib dir before Gadi's HDF5 in RPATH,
+# so we use patchelf post-install to move HDF5_DIR to the front.
+patchelf = "*"
+
 # ============================================
 # RUNTIME FEATURE (for tutorials/examples)
 # ============================================
@@ -312,3 +330,8 @@ openmpi-dev   = { features = ["conda-petsc-openmpi", "runtime", "dev"], solve-gr
 
 amr-openmpi     = { features = ["amr-openmpi"], solve-group = "amr-openmpi" }
 amr-openmpi-dev = { features = ["amr-openmpi", "runtime", "dev"], solve-group = "amr-openmpi" }
+
+# --- HPC Cluster Track (linux-64 only) ---
+# Pure Python from pixi; MPI/PETSc/h5py built from source against cluster MPI.
+# UW_CLUSTER (or hostname) selects kaiju/gadi config in build-petsc.sh.
+hpc = { features = ["hpc"], solve-group = "hpc" }