Add sketch profiles and update CI to use them

Add sketch.yaml files to both sketches defining build profiles for:
- Arduino Uno (AVR)
- ESP8266 (NodeMCU v2)
- ESP32

Update CI workflow to use profile-based compilation instead of manual
platform/library installation. This provides:
- Isolated, reproducible builds
- Auto-download of dependencies
- Consistent behavior between local dev and CI
- Simplified CI configuration

Each profile specifies:
- FQBN (Fully Qualified Board Name)
- Platform version
- IRremote library version (4.4.1)
- Platform index URLs for ESP boards

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: pidge

.github/workflows/arduino-build.yml

@@ -13,20 +13,14 @@ jobs:
     strategy:
       matrix:
         sketch:
-          - ac_control/ir_sender/ir_sender.ino
-          - ac_control/ir_receiver/ir_receiver.ino
-        board:
-          - fqbn: "arduino:avr:uno"
-            platform: "arduino:avr"
-            name: "Arduino Uno"
-          - fqbn: "esp8266:esp8266:nodemcuv2"
-            platform: "esp8266:esp8266"
-            platform-url: "https://arduino.esp8266.com/stable/package_esp8266com_index.json"
-            name: "ESP8266"
-          - fqbn: "esp32:esp32:esp32"
-            platform: "esp32:esp32"
-            platform-url: "https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json"
-            name: "ESP32"
+          - path: ac_control/ir_sender
+            name: ir_sender
+          - path: ac_control/ir_receiver
+            name: ir_receiver
+        profile:
+          - uno
+          - esp8266
+          - esp32
 
     steps:
     - name: Checkout repository
@@ -35,23 +29,10 @@ jobs:
     - name: Setup Arduino CLI
       uses: arduino/setup-arduino-cli@v1
 
-    - name: Install Arduino platform
+    - name: Compile sketch with profile ${{ matrix.profile }}
       run: |
-        if [ -n "${{ matrix.board.platform-url }}" ]; then
-          arduino-cli config init
-          arduino-cli config add board_manager.additional_urls ${{ matrix.board.platform-url }}
-        fi
-        arduino-cli core update-index
-        arduino-cli core install ${{ matrix.board.platform }}
-
-    - name: Install IRremote library
-      run: |
-        arduino-cli lib install "[email protected]"
-
-    - name: Compile sketch for ${{ matrix.board.name }}
-      run: |
-        arduino-cli compile --fqbn ${{ matrix.board.fqbn }} ${{ matrix.sketch }}
+        arduino-cli compile --profile ${{ matrix.profile }} ${{ matrix.sketch.path }}
 
     - name: Build summary
       run: |
-        echo "✅ Successfully built ${{ matrix.sketch }} for ${{ matrix.board.name }}"
+        echo "✅ Successfully built ${{ matrix.sketch.name }} for profile ${{ matrix.profile }}"

ac_control/ir_receiver/sketch.yaml

@@ -0,0 +1,21 @@
+profiles:
+  uno:
+    fqbn: arduino:avr:uno
+    platforms:
+      - platform: arduino:avr (1.8.6)
+    libraries:
+      - IRremote (4.4.1)
+  esp8266:
+    fqbn: esp8266:esp8266:nodemcuv2
+    platforms:
+      - platform: esp8266:esp8266 (3.1.2)
+        platform_index_url: https://arduino.esp8266.com/stable/package_esp8266com_index.json
+    libraries:
+      - IRremote (4.4.1)
+  esp32:
+    fqbn: esp32:esp32:esp32
+    platforms:
+      - platform: esp32:esp32 (3.3.2)
+        platform_index_url: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
+    libraries:
+      - IRremote (4.4.1)

ac_control/ir_sender/sketch.yaml

@@ -0,0 +1,21 @@
+profiles:
+  uno:
+    fqbn: arduino:avr:uno
+    platforms:
+      - platform: arduino:avr (1.8.6)
+    libraries:
+      - IRremote (4.4.1)
+  esp8266:
+    fqbn: esp8266:esp8266:nodemcuv2
+    platforms:
+      - platform: esp8266:esp8266 (3.1.2)
+        platform_index_url: https://arduino.esp8266.com/stable/package_esp8266com_index.json
+    libraries:
+      - IRremote (4.4.1)
+  esp32:
+    fqbn: esp32:esp32:esp32
+    platforms:
+      - platform: esp32:esp32 (3.3.2)
+        platform_index_url: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
+    libraries:
+      - IRremote (4.4.1)