Per review: available_parallelism() respects the hive-core process's
CPU affinity, so if it's ever affinity-pinned the denominator would
under-count and inflate cpu_pct. Read the online host CPUs from
/sys/devices/system/cpu/online instead (fall back to the process count,
then 1) so the 'percent of total host CPU' definition holds regardless.
C0NT41N3R L04D on the SYST3M tab + GET /api/container-resources.
Backend (hive-c0re/src/container_stats.rs): reads cgroup v2 cpu.stat +
memory.{current,peak,max} for each running agent machine
(machine-h\x2d<name>.scope under machine.slice), read-only/world-
readable so no hive-priv. CPU is a two-sample (~200ms) host-normalised
percentage; one shared sleep covers all agents. Skips agents whose
scope dir is absent (= not running). Network omitted: agents share the
host netns, no per-container counter.
Frontend: a polled C0NT41N3R L04D table on SYST3M (agent / cpu / mem /
peak / limit with meter bars), reusing the ST4TS table style. Polls
/api/container-resources every 5s only while the tab is active.
Backend reviewed-in-principle by damocles (path escaping + cpu delta
math); ping for the on-host sign-off.
