fix: regenerate agentic workflow lock files with gh-aw v0.84.2

Recompile all .lock.yml workflows and .github/aw/actions-lock.json with
the pinned gh-aw v0.84.2 CLI used by the verify-compiled CI check, and
restore the regenerated agentics-maintenance.yml that had been dropped.
The prior commit left these generated files partially stale (mixed
v0.83.1/v0.84.2 metadata), which the verify-compiled check flagged.

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

Author: SteveSandersonMS

.gitattributes

@@ -1,4 +1,4 @@
-.github/workflows/*.lock.yml linguist-generated=true
+.github/workflows/*.lock.yml linguist-generated=true merge=ours
 
 # Cross-platform tools rewrite these files, so keep their output deterministic.
 java/**/*.java text eol=lf

.github/aw/actions-lock.json

@@ -20,10 +20,15 @@
       "version": "v7.0.1",
       "sha": "043fb46d1a93c77aae656e7c1c64a875d1fc6a0a"
     },
-    "github/gh-aw-actions/setup@v0.86.2": {
+    "github/gh-aw-actions/setup-cli@v0.84.2": {
+      "repo": "github/gh-aw-actions/setup-cli",
+      "version": "v0.84.2",
+      "sha": "fd783ac87efde5e0c0e05d593f1906ea25b5d92e"
+    },
+    "github/gh-aw-actions/setup@v0.84.2": {
       "repo": "github/gh-aw-actions/setup",
-      "version": "v0.86.2",
-      "sha": "6aab9e5b5c91c615506061f09bedd81a23babe3c"
+      "version": "v0.84.2",
+      "sha": "fd783ac87efde5e0c0e05d593f1906ea25b5d92e"
     }
   }
 }