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-alias.md

@@ -0,0 +1,19 @@
+---
+id: kw-alias
+name: alias
+category: structure
+kind: keyword
+tokens: alias
+sig: namespace Name { alias method = function_name }
+tip: A namespace method that is another function.
+order: 69
+---
+
+Inside a <code>namespace</code> block, <code>alias m = f</code> makes <code>Name.m(...)</code> a call of <code>f</code>, checked against its parameters. It is how an engine namespace declared in Ludic forwards to the functions that implement it.
+
+```ludic
+# doc-check: skip — the aliased function lives elsewhere
+namespace Trail {
+  alias length = trail_length
+}
+```