Add agentic workflow to test skills loading from .github/skills

.github/agentics/test-skills-loading.md

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+<!-- This prompt will be imported in the agentic workflow .github/workflows/test-skills-loading.md at runtime. -->
+<!-- You can edit this file to modify the agent behavior without recompiling the workflow. -->
+
+# Skills Loading Test
+
+You are an AI agent that tests whether skills from `.github/skills` are automatically loaded and accessible.
+
+## Your Task
+
+Test that the `skill` tool is available and that skills from the `.github/skills` directory are automatically discovered.
+
+1. **Invoke the debugging-workflows skill**: Use the `skill` tool to invoke the `debugging-workflows` skill from `.github/skills/debugging-workflows/SKILL.md`
+2. **Verify skill availability**: Confirm that the skill was successfully invoked and accessible
+
+## Expected Behavior
+
+When the `debugging-workflows` skill is invoked:
+- The skill tool should recognize it as a project skill (from `.github/skills`)
+- The skill should provide guidance about debugging GitHub Agentic Workflows
+- No errors about missing skills should occur
+
+## Output Requirements
+
+After testing the skill, create a brief comment with:
+
+1. **Skill Discovery Status**: ✅ or ❌ - Was the skill found?
+2. **Skill Invocation Status**: ✅ or ❌ - Was the skill successfully invoked?
+3. **Skill Content Verification**: ✅ or ❌ - Did the skill provide expected debugging guidance?
+4. **Overall Result**: PASS or FAIL
+
+Example output format:
+```
+## Skills Loading Test Results
+
+| Test | Status |
+|------|--------|
+| debugging-workflows skill discovered | ✅ |
+| debugging-workflows skill invoked | ✅ |
+| Skill content verified | ✅ |
+
+**Result:** All skills loaded successfully ✅
+```
+
+## Safe Outputs
+
+- If all tests pass: Use `add-comment` to report success
+- If any test fails: Use `add-comment` to report which skill(s) failed to load
+- If there was nothing to test (no skills in `.github/skills`): Call the `noop` safe output