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/annotations/annot-asset.md

@@ -0,0 +1,12 @@
+---
+id: annot-asset
+name: @Asset
+category: annotations
+kind: annotation
+tokens: @Asset
+sig: @Asset("kind"[, map[, optional]]) field: string = ""
+tip: A path to a file of that kind; with map, under each map's directory.
+order: 67
+---
+
+<code>@Asset("gltf")</code> says a string field names a file of that kind. With <code>map</code> the path is under each map's directory and <code>ludicc --check</code> looks for it in every map, refusing one that lacks it unless the field says <code>optional</code>.