Add Copilot skills-frontmatter E2E scaffold and harness wiring

.github/workflows/test-copilot-skills-frontmatter.md

@@ -0,0 +1,39 @@
+---
+on:
+  workflow_dispatch:
+
+permissions:
+  issues: read
+  pull-requests: read
+  actions: read
+  contents: read
+  discussions: read
+  copilot-requests: write
+
+skills:
+  - mattpocock/skills/diagnosing-bugs@801dca688564c529fa84f247f64472520d9ebe28
+
+engine:
+  id: copilot
+
+safe-outputs:
+  create-issue:
+    title-prefix: "[copilot-test] "
+    labels: [copilot, automation]
+    samples:
+      - title: "Skills frontmatter is available"
+        body: |
+          The diagnosing-bugs skill was available during this workflow run.
+
+          Two debugging steps from the skill:
+          - Reproduce the bug consistently.
+          - Minimize the failing case before changing code.
+---
+
+Use the installed `/diagnosing-bugs` skill to answer this question: what are two concrete first steps for debugging a bug report?
+
+Then create an issue in repository ${{ github.repository }} with title "Skills frontmatter is available".
+
+The issue body must:
+- say that the diagnosing-bugs skill was available during the workflow run
+- include exactly two bullet points summarizing the debugging steps suggested by the skill

README.md

@@ -56,6 +56,7 @@ Tracking the full matrix of [safe outputs](https://github.com/github/gh-aw/blob/
 - [x] `create-code-scanning-alert` — test-copilot-create-repository-code-scanning-alert
 - [x] `mcp` — test-copilot-mcp
 - [x] `mcp` (`code_quality` toolset) — test-copilot-mcp-code-quality
+- [x] frontmatter `skills:` install + invocation — test-copilot-skills-frontmatter
 - [x] `custom safe output jobs` — test-copilot-custom-safe-outputs
 - [x] `gh-steps` — test-copilot-gh-steps
 - [x] `add-comment` — test-copilot-add-comment

e2e.sh

@@ -533,6 +533,7 @@ get_all_tests() {
     echo "test-codex-mcp"
     echo "test-copilot-mcp"
     echo "test-copilot-mcp-code-quality"
+    echo "test-copilot-skills-frontmatter"
     echo "test-claude-custom-safe-outputs"
     echo "test-codex-custom-safe-outputs"
     echo "test-copilot-custom-safe-outputs"
@@ -3426,7 +3427,7 @@ run_single_test() {
             fi
             ;;
         # Workflow dispatch tests - triggered with gh aw run
-        *"create-issue"|*"create-discussion"|*"create-pull-request"|*"create-two-pull-requests"|*"code-scanning-alert"|*"create-check-run"|*"mcp"*|*"safe-jobs"|*"gh-steps"|*"custom-safe-outputs"|*"noop"|*"report-incomplete"|*"assign-to-agent"|*"set-issue-field"|*"issue-intents")
+        *"create-issue"|*"create-discussion"|*"create-pull-request"|*"create-two-pull-requests"|*"code-scanning-alert"|*"create-check-run"|*"mcp"*|*"safe-jobs"|*"gh-steps"|*"custom-safe-outputs"|*"noop"|*"report-incomplete"|*"assign-to-agent"|*"set-issue-field"|*"issue-intents"|*"skills-frontmatter")
             local workflow_success=false
             if trigger_workflow_dispatch_and_await_completion "$workflow"; then
                 workflow_success=true
@@ -3445,7 +3446,7 @@ run_single_test() {
                             validation_success=true
                         fi
                         ;;
-                    *"create-issue")
+                    *"create-issue"|*"skills-frontmatter")
                         local title_prefix=$(get_title_prefix "$workflow" "$ai_type")
                         local expected_labels=$(get_expected_labels "$ai_type")
                         if validate_issue_created "$title_prefix" "$expected_labels" "$target_repo"; then