Collect more system info

[asmacdo]

Summary

Adds OS and Linux-distribution provenance to the system block of info.json, so downstream consumers (plot, gallery, future tooling) can tell what host a run came from without parsing free-text strings.

Schema bumped 0.2.2 → 0.2.3. Old logs read by con-duct ls are backfilled with empty strings for the new fields, so consumers can rely on the fields being present.

What's added (14 fields, all under system)

From platform.uname():
os_name, os_release, os_version, arch, processor

From platform.freedesktop_os_release() (Python 3.10+; reads /etc/os-release, falls back to "" on systems without the file):
distro_id, distro_id_like, distro_name, distro_version, distro_version_id, distro_codename, distro_variant_id, distro_pretty_name, distro_build_id

Sample system block:

 'system': {'arch': 'x86_64',
            'cpu_total': 20,
            'distro_build_id': '',
            'distro_codename': '',
            'distro_id': 'fedora',
            'distro_id_like': '',
            'distro_name': 'Fedora Linux',
            'distro_pretty_name': 'Fedora Linux 42 (Workstation Edition)',
            'distro_variant_id': 'workstation',
            'distro_version': '42 (Workstation Edition)',
            'distro_version_id': '42',
            'hostname': 'fancy',
            'memory_total': 33330028544,
            'os_name': 'Linux',
            'os_release': '6.19.12-100.fc42.x86_64',
            'os_version': '#1 SMP PREEMPT_DYNAMIC Sun Apr 12 15:27:03 UTC 2026',
            'processor': '',
            'uid': 1000,
            'user': 'austin'},

Why so many fields?

The motivation here is provenance (because everything matters), not any single consumer's branching needs. Plot logic flagged the gap (it needs to branch between Linux and macOS for pcpu), but capturing the standard os-release fields now means future readers — gallery, repro tooling, archeology — can answer questions we haven't anticipated (variant, codename, build id) without us having to re-collect.

Compatibility

• Schema version bumped to 0.2.3.
• ls.ensure_compliant_schema migrates old logs by adding empty strings for all 14 fields, matching the convention set by the 0.2.1 (working_directory) and 0.2.2 (message) migrations.
• LS_FIELD_CHOICES extended so the new fields are queryable via con-duct ls -F and --eval-filter.
• POSIX-only, matching the existing constraint imposed by os.sysconf calls in get_system_info(). On systems without /etc/os-release (macOS), the nine distro_* fields fall back to "".

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.86%. Comparing base (2cd8fb9) to head (3b05d93).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #425      +/-   ##
==========================================
- Coverage   91.87%   91.86%   -0.02%     
==========================================
  Files          15       15              
  Lines        1120     1143      +23     
  Branches      139      141       +2     
==========================================
+ Hits         1029     1050      +21     
- Misses         69       70       +1     
- Partials       22       23       +1     

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