manifest: exclude coa-ai-voiceover from the pack

1.2 GiB of MP3 voice data won't fit in the per-asset Gitea ceiling and
would make the pack 25x larger. The small AI_VoiceOver framework on its
own is useless without the data, so excluding the whole repo is the
right call. Track distribution of the voice data separately.

manifest.yaml

@@ -15,7 +15,8 @@ addons:
     note: "Gitea "Use This Template" source repo for new coa-* forks."
 
   - repo: coa-ai-voiceover
-    include: true
+    include: false
+    note: "1.2 GiB of MP3 voice data + small lua framework; far too big to bundle. Track the addon separately (see /coa/dev/addons)."
 
   - repo: coa-altoholic
     include: true