Punch/add build test

.github/workflows/build.yml

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+name: Build Test
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Cache PlatformIO
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.platformio
+            .pio
+          key: ${{ runner.os }}-pio-${{ hashFiles('**/platformio.ini') }}
+          restore-keys: |
+            ${{ runner.os }}-pio-
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install PlatformIO
+        run: |
+          python -m pip install --upgrade pip
+          pip install platformio
+
+      - name: Build firmware
+        run: pio run
+        working-directory: ${{ github.workspace }}
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        if: success()
+        with:
+          name: firmware
+          path: .pio/build/megaatmega2560/firmware.hex
+          retention-days: 7

.github/workflows/pre-commit.yml

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+name: Pre-commit Build Check
+
+on:
+  - pre-commit
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.11'
+
+    - name: Install PlatformIO
+      run: |
+        python -m pip install --upgrade pip
+        pip install platformio
+
+    - name: Build firmware
+      run: pio run

BUILD_TESTING.md

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+# LED Controller - Build Testing
+
+This repository includes automated build testing on every commit.
+
+## Automated Build Testing
+
+### GitHub Actions (CI/CD)
+
+- **Trigger**: Runs on every push and pull request to any branch
+- **Location**: `.github/workflows/build.yml`
+- **What it does**:
+  - Checks out code
+  - Sets up PlatformIO environment
+  - Builds firmware for `megaatmega2560` target
+  - Uploads firmware artifact (`.hex` file)
+  - Caches dependencies for faster builds
+
+### Local Pre-commit Hook
+
+- **Trigger**: Runs automatically before each git commit
+- **Location**: `.git/hooks/pre-commit`
+- **What it does**:
+  - Runs `pio run` to build the project
+  - Blocks commit if build fails
+  - Allows commit to proceed if build succeeds
+
+## Build Status
+
+Check the **Actions** tab on GitHub to see build status for all commits.
+
+## Manual Testing
+
+To manually test the build:
+
+```bash
+pio run
+```
+
+To skip the pre-commit hook (not recommended):
+
+```bash
+git commit --no-verify
+```
+
+## Requirements
+
+- PlatformIO Core installed locally for pre-commit hooks
+- GitHub Actions handles CI builds automatically (no local setup needed)