feat(lang): L9 resource files - registry ... from

registry NAME of RECORD [as PREFIX] from "file.lres" fills a registry from a data
file of key { field: value } entries, read at compile time with the record as its
schema: every entry is checked like a def, errors name the resource file's line,
nested records and lists of them are bare { } / [{ }] typed by their fields, and
values are expressions in the registry's module. The entries are compiled in, so
nothing parses at start-up and a build that succeeds has validated its resources.

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

examples/rejected/data/bad_tools.lres

@@ -0,0 +1,4 @@
+axe {
+  name: "Axe"
+  weight: "heavy"
+}

examples/rejected/resource_field.ludic

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+# L9: a resource file's entries are checked against the record, at the file's own line
+program ResourceField {
+  numbers float
+  property Tool {
+    key: string = ""
+    name: string = ""
+    weight: float = 0.0
+  }
+  registry Tools of Tool from "data/bad_tools.lres"
+  entry { print(TOOLS_COUNT) }
+}

examples/rejected/resource_missing.ludic

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+# L9: a registry's resource file must exist
+program ResourceMissing {
+  property Tool { key: string = "" }
+  registry Tools of Tool from "data/no_such.lres"
+  entry { print(TOOLS_COUNT) }
+}