attributes: @Node(field), @Derived, @Text, @Multiline and @Key on a field, into the schema - @Node's field must be @Asset("gltf") or an @Ref to a registry whose record has exactly one, every failure reported; reseeded

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

examples/lang/attributes.ludic

@@ -1,8 +1,8 @@
 # attributes.ludic — editor metadata on the @-syntax: which registry a field indexes, which constants
 # it takes, its range, its unit, the kind of file it names, that it is a colour, and a registry's own
 # rules (append only, saved by key). None of them changes what the program does: `ludicc
-# --emit-schema` carries them to an editor with every record, registry entry and const. One is
-# checked - @Ref must name a registry that exists.
+# --emit-schema` carries them to an editor with every record, registry entry and const. Two are
+# checked - @Ref must name a registry that exists, and @Node a field of its record naming a glTF.
 #
 # Running it prints:  2 1 Lantern 2
 program Attributes {
@@ -26,9 +26,18 @@ program Attributes {
     model: string = ""                         # its model, under assets/kit
     @Color tint: int = 16777215
     @OneOf(VD_) stocked_at: int = VD_STORE
+    @Node(model) grip: string = "grip"        # where a hand holds it, a node in that model
+    @Derived reach: float = 0.0                # worked out at boot from the model
+    @Text @Multiline blurb: string = ""        # what the shop says about it
+    @Key bind: int = 0                         # the key that takes it in hand
   }
   @AppendOnly
   registry Tools of Tool as TL from "data/attr_tools.lres"
+  # a tool hung on the camp's rack: which, and from which node of ITS model
+  property RackSlot {
+    @Ref(Tools) tool: int = 0
+    @Node(tool) hook: string = "grip"
+  }
   const CAMP_TOOLS: int = 2 * VD_COUNT         # how many a camp can carry
   # the tool a new camp starts with
   function first_tool() -> string { return Tools[0].name }

examples/rejected/node_bad.ludic

@@ -0,0 +1,18 @@
+# attributes: @Node names a field of its record that names a glTF - `handle` names no field, `tag`
+# is a plain string, and `kit` refers to a registry whose record has two models (all three are reported)
+program R {
+  property Kit {
+    key: string = ""
+    @Asset("gltf") body: string = ""
+    @Asset("gltf") lod: string = ""
+  }
+  registry Kits of Kit
+  property Tool {
+    tag: string = ""
+    @Ref(Kits) kit: int = 0
+    @Node(handle) grip: string = ""
+    @Node(tag) tip: string = ""
+    @Node(kit) hook: string = ""
+  }
+  entry { print(KITS_COUNT) }
+}