feat(lang): module NAME uses A, B - a module reaches only the modules it names

A reference from a module that declares uses into a module it does not
name is refused, exported or not, naming the use and the fix. A module
with no uses clause keeps the old rule; a package's module is always
usable; a friend is not held to it; a cycle in the declared graph is
refused; LUDIC_VIS_REPORT=1 lists the violations as uses: lines. Reseed.

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

examples/modules/valley/fishing/catch.ludic

@@ -0,0 +1,4 @@
+# fishing/catch.ludic - inherits `module fishing uses base` from its barrel
+export function cast(times: int) -> int {
+  return times * bait() - 1
+}