docs/language: a page for every keyword and attribute the vocabulary has

Keywords: module uses friend export internal numbers unsafe mut port bind action
reducer registry of as from def open alias component prop view (structure),
shows lasts then loads (scenes), system (ecs), dispatch (control), true false
null (operators). Attributes: @Ref @OneOf @Range @Unit @Asset @Color, @Node /
@Clip / @Material, @Tint @Derived, @Text / @Multiline, @Key, @AppendOnly /
@ByKey, @PerMap / @Chunked, @frame @max, @owns / @creates / @releases,
@deterministic @alloc_ok. Each is in tools/docgen/inventory.json; every fence
that is not marked skip parses (ludicc --fmt). annot-clearcolor's token loses its
quotes, which no reader strips.

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

docs/language/structure/kw-internal.md

@@ -0,0 +1,19 @@
+---
+id: kw-internal
+name: internal
+category: structure
+kind: keyword
+tokens: internal
+sig: namespace Name { internal function helper() { } }
+tip: Inside a namespace: a function kept out of the Name.* surface.
+order: 55
+---
+
+In a <code>namespace</code> block every function is part of the <code>Name.*</code> surface unless it says <code>internal</code>: then it is emitted as an ordinary helper the namespace's own methods can call, and <code>Name.helper</code> is not a method.
+
+```ludic
+namespace Trail {
+  internal function step(n: int) -> int { return n + 1 }
+  function next(n: int) -> int { return step(n) }
+}
+```