Collect CPU model, nominal/base frequency (with its source), physical
core/thread/socket counts, RAM and GPU name(s)/memory at run time
(Linux via /proc, /sys/.../cpufreq, nvidia-smi; a short best-effort on
macOS via sysctl), store it under manifest.json's new "hardware" key,
and render it as a line in the report header. Runs from before this
change have no such key; the report prints "not recorded" for them.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>