Add CLAUDE.md to assist development workflows with Claude Code#1691

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Commits on Feb 27, 2026

Add CLAUDE.md
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Commits on Feb 28, 2026

Update language description to Fortran (2023-compliant)

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Update build systems: drop CMake, add mkmf, remove GNU Make

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Add netCDF, HDF5, and MPI to dependencies list

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Update compilers: any standards-compliant, PGI to NVIDIA

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Apply suggestion from @glwagner
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Update testing description: emphasize .testing/, drop GitLab

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Main branch is main, don't single out dev/gfdl

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Note rare exceptions to no-global-data rule

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Pointers require intent, note some code is out of date

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Soften _init/_end and Local variables to conventions

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File naming: one module per file, name must match

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Add face/edge-point memory macros (SZIB_, SZJB_, SZKB_)

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Add no-double-divisions rule to arithmetic section

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Replace dev/gfdl with main in branch strategy section

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Tighten commit message format: 50-char subject, 72-col body

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Remove GFDL GitLab CI reference from CI section

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Remove line counts from source directory structure

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Remove (simplest; testing) from solo_driver desc

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Generalize infra/ description to framework interface

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Clarify !### meaning: known bugs deferred for cleanup

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Fix short-circuit advice: Fortran doesn't guarantee it

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Add no-touch signal for !### marked code

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Commits on Mar 1, 2026

Rename CLAUDE.md to AGENTS.md
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