Dogfood issue-triage with gh-aw issue intents

Add .github/workflows/issue-triage.md by importing the repo's own
canonical sample (workflows/issue-triage.md) so agentics triages its
own new and reopened issues. Compile the lock with gh-aw v0.82.1, which
wires GH_AW_RUNTIME_FEATURES into the generated lock.

Tracked by github/plan-track-agentic-toolkit#517.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: lukewar

.github/aw/actions-lock.json

@@ -20,6 +20,11 @@
       "version": "v7.0.1",
       "sha": "043fb46d1a93c77aae656e7c1c64a875d1fc6a0a"
     },
+    "github/gh-aw-actions/setup@v0.82.1": {
+      "repo": "github/gh-aw-actions/setup",
+      "version": "v0.82.1",
+      "sha": "dadd6a0a0f4d1087fbd3e115776f28471388d6db"
+    },
     "github/gh-aw/actions/setup-cli@v0.76.1": {
       "repo": "github/gh-aw/actions/setup-cli",
       "version": "v0.76.1",