A test that slept a fixed time and then asserted what a goroutine, process or
watcher did failed under the checker's load. Each now waits for its positive
evidence (a started baseline, a call counted, a state reached) within 30 s, and
the concurrency-limit tests meet at a barrier instead of overlapping by sleep.
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL
The laptop model's hardware module and a memory-pressure module for any
machine (hq research 027/03, 026/05, to-be 42 phase 3). The predecessor's
polling auto-profile and mem-guard user scripts become each module's own
Go code launched by the node runtime (ADR 0198): a profile switcher woken
by the kernel's power-supply uevents, and a guard that warns on RAM, swap
or PSI before systemd-oomd acts, on the desktop over the account's bus and
always as an event. supergfxctl and triggerhappy are kept as found
(research 027 Q1).