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/operators/kw-true.md

@@ -0,0 +1,12 @@
+---
+id: kw-true
+name: true
+category: operators
+kind: keyword
+tokens: true false null
+sig: true   false   null
+tip: The boolean literals, and the absent record, slice or string.
+order: 13
+---
+
+<code>true</code> and <code>false</code> are the two <code>bool</code> values; <code>null</code> is no record, no slice and no string - what an unset reference field holds and what a lookup that finds nothing returns.