chore(submodule): bump agentbox to b9991c0 (Nano Banana generator + hero regen)

jjohare · jjohare · commit 1c1a8a737dbe · 2026-06-14T17:13:43.000Z
Points the parent at the pushed agentbox commit carrying the zero-dep
nb-generate.cjs generator and the regenerated docs/agentbox.png hero.

Co-Authored-By: jjohare &lt;github@thedreamlab.uk&gt;
diff --git a/agentbox b/agentbox
@@ -1 +1 @@
-Subproject commit c684d0ec7deb2052b9e22f99c01022244321aa4f
+Subproject commit b9991c01226d349c46e1f28999ba92f67898d685
