feat(skills): add IoT edge skills and align agent/instruction docs (#1431)

* feat(skills): add IoT edge skills and align agent/instruction docs

* fix(ci): handle fork permission errors in plugin structure check

* fix(ci): allow intentional Spanish vocabulary in codespell

* docs(skills): translate IoT edge skill content to English

* fix(ci): pass codespell and README validation

* chore: regenerate skills index after merge

skills/arduino-azure-iot-edge-integration/references/arduino-iot-checklist.md

@@ -0,0 +1,42 @@
+# Arduino Azure IoT Checklist
+
+Use this checklist before finalizing architecture or implementation guidance.
+
+## 0) Official Arduino Baseline
+
+- Official references reviewed from <https://www.arduino.cc/en/Guide> and <https://docs.arduino.cc/>.
+- Language/API calls validated against <https://docs.arduino.cc/language-reference/>.
+- Best practices reviewed from `references/arduino-official-best-practices.md`.
+
+## 1) Device Profile
+
+- MCU model and memory constraints documented.
+- Sensor list and sampling strategy defined.
+- Power model documented (mains, battery, sleep cycles).
+
+## 2) Connectivity
+
+- Selected transport documented (MQTT over TLS preferred).
+- Network failure behavior defined.
+- Local timestamp strategy defined if device lacks RTC sync.
+
+## 3) Security
+
+- Unique identity per device.
+- No secrets in source control.
+- Credential rotation plan documented.
+- Firmware update and rollback plan documented.
+
+## 4) Edge and Cloud Flow
+
+- Routing from edge to IoT Hub documented.
+- Offline buffering limits defined.
+- Duplicate handling strategy documented.
+- Alerting thresholds and destinations defined.
+
+## 5) Validation
+
+- Connectivity soak test scenario.
+- Packet loss and reconnection test.
+- Command authorization test.
+- Firmware version and health reporting verification.