feat(lang): bind a port member that takes nothing to a variable

bind Purse { money: g_money } writes the getter bind_Purse_money in the
bind's own file, so a one-line wrapper per member is not needed; a
member that takes something is refused a variable. Reseed.

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

examples/rejected/port_var_args.ludic

@@ -0,0 +1,9 @@
+# L3: a variable answers a member that takes nothing; price takes an int, so it binds a function
+program PortVarArgs {
+  port Purse { price: fn(int) -> int }
+  var g_rate: int = 3
+  bind Purse { price: g_rate }
+  entry {
+    print(Purse.price(2))
+  }
+}