orin-status: the Orin's health on the bus

Temperatures, CPU/GPU load, memory, module power, fan, WiFi/LTE/tablet links
and the UPS battery (INA219, read-only) as envelopes on yukart/host/<signal>,
once a second. Built natively on the development Orin.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz

Cargo.toml

@@ -2,15 +2,20 @@
 name = "svc-core"
 version = "0.1.0"
 edition = "2021"
-description = "Acquisition and processing cluster: recorder now; can-bridge, obd-poller, gnss, decoder later"
+description = "Acquisition and processing cluster: recorder and orin-status now; can-bridge, obd-poller, gnss, decoder later"
 publish = false
 
 [[bin]]
 name = "recorder"
 path = "src/recorder/main.rs"
 
+[[bin]]
+name = "orin-status"
+path = "src/orin-status/main.rs"
+
 [dependencies]
 libc = "0.2"
+rumqttc = { version = "0.25", default-features = false }
 serde_json = "1"
 signal-hook = "0.3"
 zstd = "0.13"