Improve gh-aw workflow: pre-agent steps, concurrency, lock file

- Move query script execution to pre-agent steps where GH_TOKEN is
  available (agent container has scrubbed credentials)
- Add concurrency group to prevent overlapping runs
- Add pre-flight checks for data file and skill file
- Fix permissions (issues: write -> read, safe-outputs handles writes)
- Add network: defaults
- Increase timeout to 15 minutes
- Add compiled pr-review-queue.lock.yml
- Update actions-lock.json

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

Author: kubaflo

.github/aw/actions-lock.json

@@ -5,6 +5,11 @@
       "version": "v8",
       "sha": "ed597411d8f924073f98dfc5c65a23a2325f34cd"
     },
+    "github/gh-aw-actions/setup@v0.62.5": {
+      "repo": "github/gh-aw-actions/setup",
+      "version": "v0.62.5",
+      "sha": "dc50be57c94373431b49d3d0927f318ac2bb5c4c"
+    },
     "github/gh-aw/actions/setup@v0.43.19": {
       "repo": "github/gh-aw/actions/setup",
       "version": "v0.43.19",