Job Submission changes

Correctness fixes

• The OpenMP example no longer overflows int during multiplication or signed 64-bit storage for the final sum.
• The OpenMP request starts at eight CPUs instead of assuming all 128 hardware threads are useful or configured as Slurm CPUs.
• MPI uses a coherent wrapper/module stack and a small two-node request; srun is presented with a site-integration caveat.
• Job IDs are opaque rather than assumed to have four or five digits.
• Early completion and wall-time termination are explained correctly.
• Pending behavior is tied to Slurm reason codes rather than described as universally indefinite.
• --exclusive is limited to genuine whole-node cases.
• GPU toolkit and driver capability are distinguished.

Usability additions

Added a resource-model table, safe shell baseline, job arrays, accounting-driven tuning and a support checklist. Module and partition placeholders avoid freezing a historical software version into a supposedly current template.

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