wip(0.S3): packages and examples migrated again from their pre-0.S sources in one run

ludic migrate state packages <every example program> packages/ludic.lab/example/plate.ludic
  1804 vars into 126 states, 64 into lets; 23498 edits in 460 files

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/modules/tangle/b/index.ludic

@@ -1,10 +1,12 @@
 # b/index.ludic - uses a back: a and b are a cycle
 module b
-export var b_count: int = 0
+export state BState {
+  b_count: int = 0
+  b_rec: Tally = new Tally
+}
 export property Tally {
   n: int = 0
 }
-export var b_rec: Tally = new Tally
 export function b_run() -> int {
   return a_two() + c_one()
 }