Upgrade agentic workflows from gh-aw v0.72.1 to v0.80.9

- Recompile all 6 workflow lock files with gh-aw v0.80.9
- Update gh-aw-actions/setup v0.72.1 → v0.80.9
- Update actions/checkout v6.0.2 → v7.0.0
- Refresh container image pins across all workflows
- Fix learning-hub-updater.md: add missing permissions.contents: read
  (root cause of safe_outputs 'Failed to apply bundle' failures)
- Update dispatcher SKILL.md and agentic-workflows agent
- Update actions-lock.json and copilot-setup-steps.yml

Fixes: #2077 (learning-hub-updater), #2080 (cli-for-beginners-sync)
Part of: #2076

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

.github/aw/actions-lock.json

@@ -1,9 +1,9 @@
 {
   "entries": {
-    "actions/checkout@v6.0.2": {
+    "actions/checkout@v7.0.0": {
       "repo": "actions/checkout",
-      "version": "v6.0.2",
-      "sha": "de0fac2e4500dabe0009e67214ff5f5447ce83dd"
+      "version": "v7.0.0",
+      "sha": "9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0"
     },
     "actions/download-artifact@v8.0.1": {
       "repo": "actions/download-artifact",
@@ -20,15 +20,15 @@
       "version": "v7.0.1",
       "sha": "043fb46d1a93c77aae656e7c1c64a875d1fc6a0a"
     },
-    "github/gh-aw-actions/setup@v0.72.1": {
+    "github/gh-aw-actions/setup@v0.80.9": {
       "repo": "github/gh-aw-actions/setup",
-      "version": "v0.72.1",
-      "sha": "bc56a0cad2f450c562810785ef38649c04db812a"
+      "version": "v0.80.9",
+      "sha": "8c7d04ebf1ece56cd381446125da3e0f6896294a"
     },
-    "github/gh-aw/actions/setup@v0.72.1": {
+    "github/gh-aw/actions/setup@v0.80.9": {
       "repo": "github/gh-aw/actions/setup",
-      "version": "v0.72.1",
-      "sha": "489dbab88cc78e35506b5ccbf08a4037166824ac"
+      "version": "v0.80.9",
+      "sha": "a3624368c4e7d877586ff2784b61de73405e2cdd"
     }
   }
 }