Merge lang/i18nkeys (27024de) into lang/syntax: the vocabulary gains the text keys - the Key type, @TextKey (a registry's), the k"..." and kn"..." literals - and @Text's doc; docs/language pages for Key and @TextKey; ludic-dev syntax rewrote the grammars; reseeded, bootstrap-cfree fixpoint holds

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

docs/language/annotations/annot-text.md

@@ -4,9 +4,9 @@ name: @Text
 category: annotations
 kind: annotation
 tokens: @Text @Multiline
-sig: @Text @Multiline field: string = ""
+sig: @Text name: Key = null  /  @Text @Multiline blurb: string = ""
 tip: Read by the player, so translated; and prose, edited over several lines.
 order: 72
 ---
 
-<code>@Text</code> marks a string the player reads, so it is translated; <code>@Multiline</code> says it is prose, edited as several lines rather than one.
+<code>@Text</code> marks what the player reads, so it is translated. On a <code>Key</code> field a row that gives no value gets its derived key, <code>&lt;registry&gt;.&lt;row&gt;.&lt;field&gt;</code> (see <code>@TextKey</code>); English still written in a <code>@Text</code> row is counted as <code>english_left</code>. <code>@Multiline</code> says it is prose, edited as several lines rather than one.

docs/language/annotations/annot-textkey.md

@@ -0,0 +1,12 @@
+---
+id: annot-textkey
+name: @TextKey
+category: annotations
+kind: annotation
+tokens: @TextKey
+sig: @TextKey("steps") registry StepKinds of StepKind from "steps.lres"
+tip: The prefix of a registry's derived text keys, in place of its name in snake case.
+order: 73
+---
+
+A registry's <code>@Text</code> fields are keyed <code>&lt;registry&gt;.&lt;row&gt;.&lt;field&gt;</code>, the registry's name in snake case (<code>GearKinds</code> is <code>gear_kinds</code>). <code>@TextKey("steps")</code> names the prefix instead, so its rows' keys are <code>steps.&lt;row&gt;.&lt;field&gt;</code>. Every derived key is checked against the source language's <code>.po</code> (LANGUAGE.md, Text keys).