changed: allow deck refs to external words

README.md

@@ -48,7 +48,9 @@ python3 scripts/build_packages.py --update-generated-at
 - Stable word keys use `{registryId}:word:{slug-or-id}`.
 - `versionCode` changes when package content changes.
 - `contentHash` is computed from a word record excluding `contentHash`.
-- `refs.json` owns deck membership and display order.
+- `refs.json` owns deck membership and display order. A ref may point to a word
+  supplied by the same package or to an already installed dependency such as an
+  official deck word.
 - The same package shape is used for official, registry custom, imported, and
   local-exported decks.
 

scripts/deck_registry.py

@@ -205,8 +205,6 @@ def validate_source(
         if stable_word_key in ref_keys:
             errors.append(f"{context}/refs.json duplicates {stable_word_key}")
         ref_keys.add(stable_word_key)
-        if stable_word_key not in word_keys:
-            errors.append(f"{context}/refs.json[{index}] references missing package word {stable_word_key}")
         display_order = ref.get("displayOrder")
         if not isinstance(display_order, int):
             errors.append(f"{context}/refs.json[{index}] displayOrder must be an integer")