fix: prevent command injection in workflow example files

Fixes command injection vulnerabilities in example workflow files by using
environment variables instead of direct template expansion in shell commands.

This prevents malicious branch names containing command substitution syntax
like $(cmd) from being executed by the shell.

Files fixed:
- examples/ci-failure-auto-fix.yml: github.event.workflow_run.head_branch
- examples/test-failure-analysis.yml: github.event.workflow_run.name and head_branch

examples/ci-failure-auto-fix.yml

@@ -35,8 +35,11 @@ jobs:
 
       - name: Create fix branch
         id: branch
+        env:
+          SOURCE_BRANCH: ${{ github.event.workflow_run.head_branch }}
+          RUN_ID: ${{ github.run_id }}
         run: |
-          BRANCH_NAME="claude-auto-fix-ci-${{ github.event.workflow_run.head_branch }}-${{ github.run_id }}"
+          BRANCH_NAME="claude-auto-fix-ci-${SOURCE_BRANCH}-${RUN_ID}"
           git checkout -b "$BRANCH_NAME"
           echo "branch_name=$BRANCH_NAME" >> $GITHUB_OUTPUT
 

examples/test-failure-analysis.yml

@@ -53,6 +53,8 @@ jobs:
           fromJSON(steps.detect.outputs.structured_output).confidence >= 0.7
         env:
           GH_TOKEN: ${{ github.token }}
+          WORKFLOW_NAME: ${{ github.event.workflow_run.name }}
+          HEAD_BRANCH: ${{ github.event.workflow_run.head_branch }}
         run: |
           OUTPUT='${{ steps.detect.outputs.structured_output }}'
           CONFIDENCE=$(echo "$OUTPUT" | jq -r '.confidence')
@@ -63,8 +65,8 @@ jobs:
           echo ""
           echo "Triggering automatic retry..."
 
-          gh workflow run "${{ github.event.workflow_run.name }}" \
+          gh workflow run "$WORKFLOW_NAME" \
-            --ref "${{ github.event.workflow_run.head_branch }}"
+            --ref "$HEAD_BRANCH"
 
       # Low confidence flaky detection - skip retry
       - name: Low confidence detection
@@ -83,13 +85,14 @@ jobs:
         if: github.event.workflow_run.event == 'pull_request'
         env:
           GH_TOKEN: ${{ github.token }}
+          HEAD_BRANCH: ${{ github.event.workflow_run.head_branch }}
         run: |
           OUTPUT='${{ steps.detect.outputs.structured_output }}'
           IS_FLAKY=$(echo "$OUTPUT" | jq -r '.is_flaky')
           CONFIDENCE=$(echo "$OUTPUT" | jq -r '.confidence')
           SUMMARY=$(echo "$OUTPUT" | jq -r '.summary')
 
-          pr_number=$(gh pr list --head "${{ github.event.workflow_run.head_branch }}" --json number --jq '.[0].number')
+          pr_number=$(gh pr list --head "$HEAD_BRANCH" --json number --jq '.[0].number')
 
           if [ -n "$pr_number" ]; then
             if [ "$IS_FLAKY" = "true" ]; then