Merge pull request #1932 from CEED/jeremy/dev-docs

Expand style conventions in dev docs

doc - expand style conventions in dev docs

Merge pull request #1930 from CEED/zach/add-sequential-and-at-points-fixes

Add CeedOperatorCompositeSetSequential and fix edge cases in CUDA gen at points assembly

ci: add sequential composite operator test

backends(cuda/ref,hip/ref): fix use of incorrect output field index

backends(cuda/gen,hip/gen): fix at-points assembly to avoid writing to non-active outputs

operator(composite): add interface to force sequential execution of sub-operators

Merge pull request #1929 from CEED/jeremy/readme-minor

minor - style consistency for bibtex in README

minor - style consistency for bibtex in README

Merge pull request #1927 from CEED/jeremy/scalar-multiplicity

Scalar Multigrid Multiplicity

pc - test to use scalar or multi-comp mult vector

pc - use scalar multiplicity vec for multigrid

minor - style consistency

gallery - add scalar scaling qf

gallery - add identity to scalar qf

Merge pull request #1926 from CEED/jeremy/typo

minor - typo

minor - typo

Merge pull request #1924 from hughcars/fix-march-native-arm

Fix gcc `-march=native` for arm mac

ci: preserve CI job names, add apple-clang test

Map compiler display names to actual binaries in a step instead of
using matrix include/exclude, so job names stay as gcc/clang. Adds
a separate apple

ci: preserve CI job names, add apple-clang test

Map compiler display names to actual binaries in a step instead of
using matrix include/exclude, so job names stay as gcc/clang. Adds
a separate apple-clang job on macOS to test the system compiler.

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Merge pull request #1923 from CEED/jeremy/dealii-kokkos

deal.II Example - Kokkos Support

make: use -mcpu=native for GCC and Clang on non-x86 architectures

On ARM, -march=native resolves to CPU names (e.g., apple-m1) which are
invalid for -march; must use -mcpu=native instead. Use uname

make: use -mcpu=native for GCC and Clang on non-x86 architectures

On ARM, -march=native resolves to CPU names (e.g., apple-m1) which are
invalid for -march; must use -mcpu=native instead. Use uname -m to detect
architecture and select the appropriate flag. Clang has the same limitation,
so MARCHFLAG.clang follows MARCHFLAG.gcc.

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ci: fix macOS tests to use explicit GCC and LLVM compilers

The "gcc" on macOS is a symlink to Apple Clang, so the existing matrix
was testing Apple Clang twice instead of testing distinct compilers.

ci: fix macOS tests to use explicit GCC and LLVM compilers

The "gcc" on macOS is a symlink to Apple Clang, so the existing matrix
was testing Apple Clang twice instead of testing distinct compilers.

Fix by testing three explicit compilers on macOS:
- clang: Apple Clang (system)
- gcc-15: real GCC from Homebrew
- llvm: LLVM 18 from Homebrew

Print compiler version to make the distinction visible in CI output.

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dealii - add gpu version with kokkos

Merge pull request #1921 from CEED/jeremy/fortran-ex-1

ex - add fortran ex1

ex - add fortran ex1