define format conventions

from editorconfig.org:
EditorConfig helps maintain consistent coding styles for multiple
developers working on the same project across various editors and IDEs.
The EditorC

define format conventions

from editorconfig.org:
EditorConfig helps maintain consistent coding styles for multiple
developers working on the same project across various editors and IDEs.
The EditorConfig project consists of a file format for defining coding
styles and a collection of text editor plugins that enable editors to
read the file format and adhere to defined styles. EditorConfig files
are easily readable and they work nicely with version control systems.

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Merge remote-tracking branch 'origin/release'

doc: update numpy requriement - as 2.0.0 fails to build with "Apple clang version 17.0.0 (clang-1700.6.3.2)"

Merge remote-tracking branch 'origin/release'

Nominate Martin Diehl to the PETSc council

Doc: fix some typos in the PETSc BoF agenda

Thanks-to: Lois Curfman McInnes <curfman@anl.gov>

Deprecate -matmatmult_Bbn in favor of -matproduct_batch_size

See also -ksp_matsolve_batch_size

Merge branch 'jrwrigh/petscsection_distribute_data' into 'main'

feat: Add PetscSectionMigrateData()

See merge request petsc/petsc!8963

feat(section): Add PetscSectionDistributeData()

This is a copy/paste of `DMPlexDistributeData()`, but brought up to the
PetscSection interface because the routine is completely generic

Co-authored-

feat(section): Add PetscSectionDistributeData()

This is a copy/paste of `DMPlexDistributeData()`, but brought up to the
PetscSection interface because the routine is completely generic

Co-authored-by: Barry Smith <bsmith@mcs.anl.gov>

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Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now t

Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now the standard for passing in contexts
- PetscCtxRt ctx is the standard for passing out contexts, including context destroy routines based on PetscCtxDestroyFn

Both of these are typedef to void*

Also removed most use of user and userctx for context arguments now consistently named ctx

Improved documentation on PetscCtx and PetscCtxRt and on how to use contexts (including getting them) from Fortran

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Merge branch 'release'

Increase patchlevel to 3.24.4

Merge remote-tracking branch 'origin/release'

Doc: add the 2026 CASS BoF days PETSc session

Merge remote-tracking branch 'origin/release'

Style guide for makefiles

Change script name to $PETSC_DIR/lib/petsc/bin/petscfreesharedmemory.sh

from $PETSC_DIR/lib/petsc/bin/petscfreesharedmemory

This is part of the process of better organizing the shell script usage
i

Change script name to $PETSC_DIR/lib/petsc/bin/petscfreesharedmemory.sh

from $PETSC_DIR/lib/petsc/bin/petscfreesharedmemory

This is part of the process of better organizing the shell script usage
in PETSc. Since this functionality is not commonly used it is ok to just change

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Doc: Fix 'WLS' typo

Acronym for 'Windows Subsystem for Linux 2' should be 'WSL' instead of 'WLS'

Add petsc4py stubs to changelog

DMPlex: Add DMPlexGetLETKFLocalizationMatrix() to compute localization weight matrix for LETKF

Use Kokkos to create a localization matrix for the LETKF data assimilation method

Tools: Use Gemini Co

DMPlex: Add DMPlexGetLETKFLocalizationMatrix() to compute localization weight matrix for LETKF

Use Kokkos to create a localization matrix for the LETKF data assimilation method

Tools: Use Gemini Code Assist

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Merge branch 'fix-options-left' into 'main'

Fixes doc and behaviour of an unset -options_left value as reported in #1834.

Closes #1834

See merge request petsc/petsc!8905

Merge branch 'barry/2025-12-27/ftn-rm-funname-interface-definition' into 'main'

Remove the function name from generated Fortran interface definitions.

Closes #1838

See merge request petsc/petsc!89

Merge branch 'barry/2025-12-27/ftn-rm-funname-interface-definition' into 'main'

Remove the function name from generated Fortran interface definitions.

Closes #1838

See merge request petsc/petsc!8921

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Merge branch 'barry/2026-01-04/fix-docs-no-release-branch' into 'main'

Fix make docs when there is no release branch in the repository

See merge request petsc/petsc!8935

Merge branch 'barry/2025-12-24/improve-snes-domain-error-handling' into 'main'

Improve the propagation of function domain error handling in SNES, especially...

See merge request petsc/petsc!8914

Merge branch 'jczhang/2025-12-25/mumps-out-of-core' into 'main'

Support MUMPS out-of-core facility

Closes #1116

See merge request petsc/petsc!8915