feat(cli): add --tag flag to hyperframes add for bulk install

Install all registry blocks matching a tag in one command:

  hyperframes add --tag vfx       # installs all 7 VFX blocks
  hyperframes add --tag captions  # installs all 5 caption blocks

The resolver loads each item's full manifest to check tags, then
installs matching blocks sequentially. Failed items are skipped
with a warning so one broken block doesn't abort the batch.

Also supports JSON output for CI: hyperframes add --tag vfx --json

packages/cli/src/registry/index.ts

@@ -5,7 +5,13 @@ export {
   fetchItemFile,
 } from "./remote.js";
 
-export { listRegistryItems, loadAllItems, resolveItem, type ResolveOptions } from "./resolver.js";
+export {
+  listRegistryItems,
+  loadAllItems,
+  resolveItem,
+  resolveItemsByTag,
+  type ResolveOptions,
+} from "./resolver.js";
 
 export {
   installItem,

packages/cli/src/registry/resolver.ts

@@ -87,3 +87,19 @@ export async function resolveItem(
   }
   return fetchItemManifest(entry.name, entry.type, options.baseUrl);
 }
+
+/**
+ * Resolve all items matching a tag. Loads each item's full manifest to check
+ * tags (the top-level registry.json only has name+type, not tags). Items that
+ * fail to load are silently skipped.
+ */
+export async function resolveItemsByTag(
+  tag: string,
+  options: ResolveOptions = {},
+): Promise<RegistryItem[]> {
+  const entries = await listRegistryItems(undefined, options);
+  const allItems = await loadAllItems(entries, { ...options, onWarn: () => {} });
+  return allItems.filter(
+    (item) => "tags" in item && Array.isArray(item.tags) && item.tags.includes(tag),
+  );
+}