submodule: update specification - reorganize handbook structure

Guo-Zhang · Guo-Zhang · commit a0cb225c528e · 2026-04-08T20:46:48.000+08:00
diff --git a/docs/specification b/docs/specification
@@ -1 +1 @@
-Subproject commit 755949700c439df4eb34b39bab834b49a66d877e
+Subproject commit 866fa8cddd4176db99358eb5bc2d9c8d1301ba78
