feat(status): show sacct accounting fields for completed Slurm jobs

[ultimatile]

Summary

• hpc status <id> on a terminal Slurm job now prints ExitCode, Elapsed, MaxRSS, and ReqMem alongside the raw sacct State string, fetched via a single sacct -j <id> --format=JobID,State,ExitCode,Elapsed,MaxRSS,ReqMem --noheader -P call.
• The polling path (status_cmd / parse_status / wait_for_job) is left untouched. The new detail path is consumed only by cli.status.
• PJM (and any newly-submitted Slurm job that sacct has not yet recorded) falls back to the prior single-line display.
• MaxRSS is selected as the unit-aware maximum across all non-empty step rows, so jobs that dispatch via srun (where .batch only reflects the launcher) report the workload's real RSS rather than the launcher's small footprint.
• The raw sacct State string is preserved verbatim in the output (e.g. OUT_OF_MEMORY, CANCELLED+, CANCELLED by 12345); the JobStatus enum is not extended.

Test plan

• uv run pytest — 138 passed (baseline 119 + 19 new).
• uv run ruff check — All checks passed.
• uv run ruff format --check — clean.
• uv run pyright src/hpc/ — 0 errors, 0 warnings.

Closes #5

[Copilot]

Pull request overview

Adds a Slurm-specific “detail” path for hpc status <jobid> that surfaces useful sacct accounting fields for completed jobs, while keeping the existing polling/status logic unchanged for other call sites.

Changes:

• Introduced JobDetail plus Slurm sacct detail command + parser (including unit-aware MaxRSS selection across steps).
• Added JobManager.get_job_detail() and updated cli.status to render accounting fields for terminal Slurm states (with fallback when detail is unavailable / unsupported).
• Added comprehensive unit tests for scheduler parsing, JobManager behavior, and CLI output formatting/fallbacks.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/test_scheduler.py	Adds unit tests for Slurm detail_cmd and parse_detail, plus PJM “detail not supported” coverage.
tests/test_job.py	Adds tests for JobManager.get_job_detail() behavior for Slurm vs PJM.
tests/test_cli.py	Adds CLI-level tests verifying detailed output for terminal jobs and fallback behavior.
src/hpc/scheduler.py	Adds JobDetail, Slurm sacct detail command, and parsing logic (including unit-aware MaxRSS max across steps).
src/hpc/job.py	Adds get_job_detail() API to retrieve scheduler accounting details.
src/hpc/cli.py	Updates status to display sacct details for terminal Slurm states and preserve raw state strings.

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