tests: the map-scoped tables' example and rejected fixtures

examples/lang/permap (two maps, a chunked table with a negative, a positive and a
missing chunk, constants and fn by name, a nested list, a cross-row @Ref, a reload
shrinking in place, a bad file's file:line:col; built under arena strict with an @On
frame root), --check fixtures for a wrong field, a wrong type, an unknown constant and
a dangling cross-row @Ref, @Ref(PerMap) on an int, as PREFIX, and a @Unit warning.

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

examples/rejected/permap_prefix.ludic

@@ -0,0 +1,7 @@
+# permap_prefix.ludic - a @PerMap registry's keys are not known when the program compiles, so it has
+# no `as PREFIX` and no constants
+program PerMapPrefix {
+  property Spot { key: string = "" }
+  @PerMap registry Spots of Spot as SPOT from "spots.lres"
+  entry { print(1) }
+}