wesandClaude Opus 4.8
d57c2b21d2
canbus: decode the water-heater DSI fault + add fault binary_sensors
Forced a real lockout (captures/dsi-fault-*.log) and diffed vs the healthy
baseline:
- Water-heater DSI fault = node 95 page-3 b0 bit5 (0x20). Healthy 0x80/0x81,
fault 0xA0. (Earlier suspects b1=FF and node AE were both wrong.)
- Bus-wide "system fault present" = page-0 b0 bit0 (every node flips 02->03).
Both wired into esphome/onecontrol-canbus.yaml as binary_sensor (device_class:
problem). README + HANDOFF updated; DSI item closed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>