test: compile doc-freshness workflow + temporary push trigger

Temporarily adds a push trigger on emaher-doc-freshness-workflow to test the
agentic workflow before merge. WILL BE REVERTED before merge.

Also fixes gh aw compile errors so the workflow builds:
- remove invalid 'add-comment: max: 0' (omitting disables comments)
- 'issues: write' -> 'issues: read' (safe-outputs handles issue creation)
- switch cron to fuzzy schedule 'weekly on monday'
- move since_date into env to avoid shell-injection auto-rewrite

Author: EMaher

.gitattributes

@@ -3,3 +3,5 @@
 .squad/agents/*/history.md merge=union
 .squad/log/** merge=union
 .squad/orchestration-log/** merge=union
+
+.github/workflows/*.lock.yml linguist-generated=true merge=ours

.github/aw/actions-lock.json

@@ -0,0 +1,9 @@
+{
+  "entries": {
+    "github/gh-aw-actions/setup@v0.80.9": {
+      "repo": "github/gh-aw-actions/setup",
+      "version": "v0.80.9",
+      "sha": "8c7d04ebf1ece56cd381446125da3e0f6896294a"
+    }
+  }
+}