feat(aspen): port CARLISLE structured logging, state markers, and jobby integration

[kopardev]

Changes

Port structured logging and UX improvements from CARLISLE's carlisle wrapper to ASPEN's aspen CLI script.

Phase 1 – Logging layer + cosmetic cleanup

• Add 7 log functions: log_info, log_step, log_ok, log_warn, log_error, log_next, log_divider
• Replace the noisy err() ASCII-art heredoc with a clean log_error "$@"; exit 1
• Replace all raw echo calls in init(), preruncleanup(), reconfig(), set_singularity_binds(), dryrun(), runlocal(), runslurm(), run() local branch, reset(), and main()
• dryrun() now prints log_ok + log_next guidance on completion

Phase 2 – Pre-run summary + print_versions()

• New print_versions() function prints Snakemake and Singularity versions with OK/WARN status
• runslurm() and runlocal() print a structured pre-run summary (mode, workdir, genome, log file, singularity cache) before launching

Phase 3 – Pipeline state markers + SIGTERM trap + jobby

• New json_escape(), write_pipeline_state_marker(), and run_jobby_best_effort() functions
• write_pipeline_state_marker() writes pipeline.{running,completed,failed,canceled} marker files and a pipeline.status.json sidecar in WORKDIR for machine-readable status tracking
• submit_script.sbatch now embeds inline _write_pipeline_state_marker(), SIGTERM/SIGINT traps, ${PIPESTATUS[0]} exit-code capture, jobby post-run call (module load ccbrpipeliner fallback), and proper success/failure state writes
• Stale-script guard: old submit_script.sbatch files lacking state marker logic are backed up and regenerated automatically
• sbatch --parsable captures SLURM job ID; log_next guidance printed after submission (squeue, tail -f snakemake.log, pipeline.* status, sidecar path)

Issues

Closes #118

PR Checklist

• This comment contains a description of changes with justifications, with any relevant issues linked.
• Update docs if there are any API changes. (no API changes; this is CLI cosmetic/logging only)
• Update CHANGELOG.md with a short description of any user-facing changes and reference the PR number. Guidelines: https://keepachangelog.com/en/1.1.0/
• Test run completes successfully on biowulf.