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-component.md

@@ -0,0 +1,21 @@
+---
+id: kw-component
+name: component
+category: structure
+kind: keyword
+tokens: component
+sig: component Name[(states)] { prop p: T = v, state s: T = v, function ..., on e(...) { } }
+tip: A UI component: its props, state, functions and events, beside Name.xml and Name.lss.
+order: 70
+---
+
+A <code>component</code> is a piece of interface: the code file declares its <code>prop</code>s (handed in by its parent), its own <code>state</code>, the functions its template calls and the events it handles with <code>on</code>; <code>Name.xml</code> beside it is its template and <code>Name.lss</code> its styles. The states named in its header are supplied by the runtime and never seen by the template.
+
+```ludic
+# doc-check: skip — a component needs its template beside it
+component Counter {
+  prop step: int = 1
+  state count: int = 0
+  on add() { count = count + step }
+}
+```