Add run-tests skill - Test execution utility

- Level 1 utility skill
- Multiple test scopes (all/unit/snapshot/specific)
- Argument hints and triggers
- Paparazzi snapshot testing support

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Canato

.claude/skills/run-tests.md

@@ -0,0 +1,72 @@
+---
+name: run-tests
+description: Run tests for Android Image Cropper
+argument-hint: "[test-scope: all|unit|snapshot|specific-class]"
+level: 1
+triggers:
+  - "run tests"
+  - "test"
+  - "run all tests"
+---
+
+# Run Tests Skill
+
+Run the test suite for Android Image Cropper with various configurations.
+
+## Usage
+
+Run this skill to execute tests with different scopes:
+- All tests (default)
+- Unit tests only
+- Specific test class
+- With code coverage
+
+## Commands
+
+### Run All Tests
+```bash
+./gradlew testDebug
+```
+
+### Run With Full Validation
+```bash
+./gradlew licensee ktlint testDebug build --stacktrace
+```
+
+### Run Specific Test Class
+```bash
+./gradlew testDebug --tests "com.canhub.cropper.BitmapUtilsTest"
+```
+
+### Run Paparazzi Snapshot Tests
+```bash
+./gradlew verifyPaparazziDebug
+```
+
+### Record New Paparazzi Snapshots
+```bash
+./gradlew recordPaparazziDebug
+```
+
+## Test Output
+
+Tests output to: `cropper/build/reports/tests/testDebugUnitTest/index.html`
+
+## What to Check After Running
+
+1. ✅ All tests pass
+2. ✅ No flaky tests
+3. ✅ Coverage is adequate
+4. ✅ No test errors or warnings
+5. ✅ Snapshot tests match (if applicable)
+
+## Common Issues
+
+### Issue: Paparazzi snapshots differ
+**Solution**: Review changes, if correct run: `./gradlew recordPaparazziDebug`
+
+### Issue: Robolectric tests fail
+**Solution**: Check Android version compatibility, update Robolectric if needed
+
+### Issue: Tests timeout
+**Solution**: Large images may cause timeouts, check bitmap sizes in tests