Add short trigger syntax for labeled events with explicit item types

examples/label-trigger-discussion.md

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+---
+name: Label Trigger Example - Discussion
+description: Example workflow demonstrating the discussion labeled trigger shorthand syntax
+on: discussion labeled question announcement help-wanted
+engine:
+  id: codex
+  model: gpt-5-mini
+strict: true
+---
+
+# Label Trigger Example - Discussion
+
+This workflow demonstrates the discussion labeled trigger shorthand syntax:
+
+```yaml
+on: discussion labeled question announcement help-wanted
+```
+
+This short syntax automatically expands to:
+- Discussion labeled with any of the specified labels (question, announcement, help-wanted)
+- Workflow dispatch trigger with an item_number input parameter
+
+Note: GitHub Actions does not support the `names` field for discussion events, so label filtering
+must be handled via job conditions if needed. The shorthand still provides workflow_dispatch support.
+
+## Task
+
+When this workflow is triggered, acknowledge that it was triggered and provide a brief summary.
+
+Example output:
+```
+✅ Workflow triggered!
+📋 This workflow responds to label events on discussions
+```

examples/label-trigger-pull-request.md

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+---
+name: Label Trigger Example - Pull Request
+description: Example workflow demonstrating the pull_request labeled trigger shorthand syntax
+on: pull_request labeled needs-review approved ready-to-merge
+engine:
+  id: codex
+  model: gpt-5-mini
+strict: true
+---
+
+# Label Trigger Example - Pull Request
+
+This workflow demonstrates the pull_request labeled trigger shorthand syntax:
+
+```yaml
+on: pull_request labeled needs-review approved ready-to-merge
+```
+
+This short syntax automatically expands to:
+- Pull request labeled with any of the specified labels
+- Workflow dispatch trigger with an item_number input parameter
+
+## Task
+
+When this workflow is triggered, acknowledge that it was triggered and provide a brief summary.
+
+Example output:
+```
+✅ Workflow triggered for PR!
+📋 This workflow responds to label events on pull requests
+```