Measured on demo-hp 2026-10-27: qBittorrent 5.2.4 kept sending at full speed for ~14 s after its limit fell to
1 KiB/s; the agent reads the uplink 5-15 s after the call, so every test on request was refused "not quiet"
(four tries in an hour, 4.0-4.2 Mbit/s). waitDrained polls each held app's own upload (qBittorrent up_info_speed,
Transmission uploadSpeed) until <= 16 KiB/s twice, 2 s apart, at most 90 s; an unreadable speed waits 20 s.
Tests TestR1250_* (five), red-proved by four mutations.
When the agent waits for quiet and qBittorrent or Transmission runs: record the limit first,
hold at 1 KiB/s, ask the agent for a test on request, put the old limit back (deferred; a
household change during the test stays). Start-up puts back a limit a killed controller left;
the 50 % rule skips while a hold record exists. Commit only.