Refresh generator refdocs snapshot for the amy 1.2.43 pin

python3 tulip/server/sync_amy_docs.py against amy@3a7c176; only the
source marker changed (doc contents are identical to the previous pin).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: bwhitman

tulip/server/refdocs/amy/_VENDORED_FROM.txt

@@ -1,3 +1,3 @@
 Auto-generated by tulip/server/sync_amy_docs.py — do not edit by hand.
-Source: amy@b046a75c469bbaa5b4fa9d58cd385cf43f66d0cb
+Source: amy@3a7c1768198ed84d270353d847054ae483a26635
 Files: api.md, arduino.md, billie_jean.md, godot.md, juno_patches.md, midi.md, synth.md, upgrading.md