Add agentic workflow for automated issue triage (#4177)

* Add agentic workflow for automated issue triage

Introduces a GitHub Agentic Workflow (gh-aw) that automatically triages
new issues using Copilot. The workflow:

- Classifies issue type (Bug/Feature/Question/Task)
- Validates environment details for bugs
- Assigns area labels based on issue content
- Searches for duplicate issues in the repo
- Checks for regressions
- Posts a single consolidated triage summary comment
- Assigns Copilot coding agent for confirmed bugs with complete info

Files added:
- .github/workflows/issue-triage.md (workflow definition)
- .github/workflows/issue-triage.lock.yml (compiled Actions YAML)
- .github/aw/actions-lock.json (pinned action versions)

* Align triage label names with issue template conventions

* Constrain to single area label to stay within max:5 safe-outputs limit

* Address PR review: roles:all, min-integrity:none, explicit permissions, fix Bug classification wording, fix Needs More Info label format

* Recompile triage workflow with gh-aw v0.68.1 (MCP gateway v0.2.17, AWF v0.25.18)

* Update issue-triage: add Required Context, Phase 2 assign-to-agent, AI disclaimer

* Fix label name: align 'Triage Needed 🆕' with repo convention

Author: priyankatiwari08

.gitattributes

@@ -61,3 +61,5 @@
 #*.PDF   diff=astextplain
 #*.rtf   diff=astextplain
 #*.RTF   diff=astextplain
+
+.github/workflows/*.lock.yml linguist-generated=true merge=ours

.github/aw/actions-lock.json

@@ -0,0 +1,14 @@
+{
+  "entries": {
+    "actions/github-script@v8": {
+      "repo": "actions/github-script",
+      "version": "v8",
+      "sha": "ed597411d8f924073f98dfc5c65a23a2325f34cd"
+    },
+    "github/gh-aw-actions/setup@v0.68.1": {
+      "repo": "github/gh-aw-actions/setup",
+      "version": "v0.68.1",
+      "sha": "2fe53acc038ba01c3bbdc767d4b25df31ca5bdfc"
+    }
+  }
+}