docs(ups): document apcupsd test results and Energy Dashboard limitations

The APC Smart-UPS C 1500 (FW 02.2, mfg 2012) does not expose ups.load or
ups.realpower over USB HID. Tested apcupsd as an alternative — it reads the
same HID descriptor and returned COMMLOST. Debian's apcupsd package also
conflicts with nut-server (mutually exclusive).

Documented that the HA NUT integration provides battery/runtime/status sensors
only, not wattage for the Energy Dashboard. Practical path is a smart plug on
the UPS output. Updated daily-ops examples (removed ups.load reference since
the variable doesn't exist on this UPS).

NUT stack fully restored after the apcupsd test cycle.

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STATUS.md

@@ -85,8 +85,10 @@ infrastructure, Proxmox cluster ops, and k8s control plane.
   Needs physical reseat to direct motherboard USB port or cable replacement.
   Driver masked to prevent restart-loop spam.
 - [ ] **Home Assistant NUT integration:** configured and live (3 sensors:
-  battery charge, status, status data). Additional sensors populate as UPS
-  reports more variables.
+  battery charge, status, status data). This APC (FW 02.2, mfg 2012) does not
+  report `ups.load` over USB HID — confirmed via both NUT and apcupsd tests.
+  No wattage for Energy Dashboard; smart plug on UPS output is the practical
+  path. apcupsd package conflicts with nut-server (mutually exclusive).
 
 ### Console Management (ser2net telnet(rfc2217) + conman on pfv-tsys4 — LIVE)
 - [x] 7 network switch/router consoles managed via ser2net + conman
@@ -166,7 +168,7 @@ infrastructure, Proxmox cluster ops, and k8s control plane.
 - **Friday maintenance:** tsys4 (PCIe NIC + RAM), tsys5 (2nd CPU candidate, NVMe, 2nd ethernet)
 - **PDU:** Rename outlets in powerman.conf (Friday onsite)
 - **k8s deferred:** ETL tooling, HPC scheduler, vcluster policy, solar-aware scale-out
-- **UPS:** APC Smart-UPS C 1500 operational via NUT on pfv-tsys1. HA NUT integration live (battery charge, status, status data sensors). Tripp Lite blocked on HID report descriptor (USB hub/cable issue — try direct motherboard port).
+- **UPS:** APC Smart-UPS C 1500 operational via NUT on pfv-tsys1. HA NUT integration live (battery charge, status sensors). No ups.load over USB HID (firmware limitation, confirmed via apcupsd test). Tripp Lite blocked on HID report descriptor (USB hub/cable issue — try direct motherboard port).
 
 ## Infrastructure Summary