Power-off spike (Part A) on the N100: plugswitch, wall-power figures, the hub's view

plugswitch.py refuses 'off' unless 20 s of readings show the N100 is already off (standby + 1 W,
no ping); 7 tests, each check red-proofed. By hand: guest shutdown 12 s, host off, 0.0 W; the hub
stayed silent and 'ONLINE' for 18 min; plug off/on did not start the N100, its power button did
(dashboard in 42 s). Wall figures into SIZING.md 4 and sizing.json power (8.5 / 20.7 / 0.0 W).

scripts/CHANGELOG.md

@@ -1,3 +1,14 @@
+## 2026-10-13 (evening) — power-off spike on the N100: plugswitch, wall-power figures
+
+- New `scripts/bench/plugswitch.py` (`on`/`off`/`status`) + `test_plugswitch.py` (7 tests): `off` refuses unless 20 s of
+  readings sit below the measured standby + 1 W and the N100 answers no ping. Red-proofed: each of the four checks
+  removed in turn, a test convicted each. Live: refused while the N100 ran; a slow-read bug (window cut to 16 s) found
+  and fixed live.
+- `documentation/audits/poweroff-2026-10-13/`: Part A by hand — guest shutdown 12 s, host off 13 s later, 0.0 W off;
+  hub silent for 18 min (still „ONLINE"); plug off/on did NOT start the N100, the power button did (dashboard in 42 s).
+- `sizing-2026-10-13`: wall figures in `SIZING.md` §4 and `sizing.json` `power` (8.5 W rest, 20.7 W work, 0.0 W off);
+  the CPU-only RAPL figures kept under `power.cpu_rapl`.
+
 ## 2026-10-13 (evening) — plugmeter: the N100's power plug, read from DooPlex
 
 - New `scripts/bench/plugmeter.py` + `scripts/bench/README.md`: reads the Tuya meter plug the N100 runs on and prints