Add agentic issue-intents triage workflow (#610)

New installation of a gh-aw issue triage workflow for opened/reopened
issues. Uses built-in issue-intent safe outputs (set-issue-type,
add-labels) with rationale/confidence and suggestion routing, plus a
minimal add-comment for missing info. No custom API jobs; no issue-field
mutations (repo has no evidence of issue-field usage). Does not close
issues and preserves existing labels.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: c0a9055b-20f2-4c86-abd0-51f813c0418b

Author: alondahari

.gitattributes

@@ -0,0 +1 @@
+.github/workflows/*.lock.yml linguist-generated=true merge=ours

.github/aw/actions-lock.json

@@ -0,0 +1,14 @@
+{
+  "entries": {
+    "github/gh-aw-actions/setup-cli@v0.83.1": {
+      "repo": "github/gh-aw-actions/setup-cli",
+      "version": "v0.83.1",
+      "sha": "8bdba8075360648fe6802302a5b4e016361dc6ac"
+    },
+    "github/gh-aw-actions/setup@v0.83.1": {
+      "repo": "github/gh-aw-actions/setup",
+      "version": "v0.83.1",
+      "sha": "8bdba8075360648fe6802302a5b4e016361dc6ac"
+    }
+  }
+}