[krokicki]

Summary

• New SlurmExecutor (cluster_api/executors/slurm.py) behind the existing Executor interface: sbatch --parsable submission, sacct status polling, scancel cancellation, squeue+sacct reconnect.
• Every directive and flag is sourced from submitit, clusterfutures, dask-jobqueue, Nextflow or the SLURM man pages; see docs/superpowers/specs/2026-10-18-slurm-executor-design.md and the design review alongside it.
• --no-requeue on every job so preempted/node-failed jobs are terminal; --dependency=afterok --kill-on-invalid-dep=yes for depends_on; --export=NONE + in-script exports for inherit_env=False; bash -l shebang for login_shell.
• Array elements are re-keyed from 123_4 to the base class's 123[4] form so poll() aggregation is unchanged; compressed pending ranges are expanded with SLURM_BITSTR_LEN=0.
• Signal-terminated jobs report exit_code = -signal, matching the local executor.
• New CI job slurm-integration runs tests/test_slurm_integration.py on a real single-node SLURM with slurmdbd (koesterlab/setup-slurm-action); CLUSTER_API_REQUIRE_SLURM=1 turns the module's skip into a failure so the job cannot pass green by skipping.
• Docs: README SLURM notes and profile example, API/Development/CLAUDE updates. Version 0.9.0.

Test plan

• pixi run check (267 passed)
• slurm-integration CI job green

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