fix(lang): the action drain is the program's; --check runs every check a build makes; a registry key named count is refused; name lookups are tables

- the function that calls every reducer (and the action queue) is written in the program's own
  file: in the first action's file it belonged to that module, depended on every module with a
  reducer, and joined a game's modules into one 69-module cycle (examples/actions/modules and a
  ludic deps case hold it); the state instances, the queue and the reducers make no deps edges
- ludicc --check / ludic build --check lower the program too and write nothing, so the code
  writer's refusals are in it: a bind to a function that is gone, an unknown name (and the checker
  now refuses fn <missing> itself); rejects bind_missing_fn, unknown_name, registry_count_key
- def R count is refused: its constant would be PREFIX_COUNT, the registry's size
- a file's module, package, trust and numbers-float are tables, and from the check on the lookups
  of functions, enums, records, globals and externs are too (tagged enums kept as a list): Maroon
  Lake's check-only build went from about 20 s to 7 s including lowering, its IR from about 2
  minutes to under 10 s; duplicate declarations are found by table, not a pair of loops
- threads.ludic's pool check gives each call a little work, so a busy machine cannot run them all
  on the caller before a worker wakes (it failed one run in three under load)

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

examples/rejected/bind_missing_fn.ludic

@@ -0,0 +1,6 @@
+# a port bound to a function that is not there: refused by a check-only build too
+program BindMissingFn {
+  port Clock { now: fn() -> int }
+  bind Clock { now: fn no_such_clock }
+  entry { print(Clock.now()) }
+}

examples/rejected/registry_count_key.ludic

@@ -0,0 +1,8 @@
+# a def keyed `count` would be TL_COUNT, the registry's own size
+program RegistryCountKey {
+  property Tool { key: string = "", n: int = 0 }
+  registry Tools of Tool as TL
+  def Tools count { n: 1 }
+  def Tools axe { n: 2 }
+  entry { print(TL_COUNT) }
+}

examples/rejected/unknown_name.ludic

@@ -0,0 +1,4 @@
+# a name that is nothing: refused by a check-only build as by a build
+program UnknownName {
+  entry { print(no_such_name + 1) }
+}