chore: sync from fn-registry agent

data_registry.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+struct sqlite3;
+
+struct OdrRegistry {
+    sqlite3* db = nullptr;
+};
+
+struct RegistryRow {
+    std::string id;
+    std::string name;
+    std::string kind;        // function | pipeline | component
+    std::string lang;        // go | py | bash | ts | cpp
+    std::string domain;
+    std::string purity;      // pure | impure
+    std::string signature;
+    std::string description;
+};
+
+bool registry_open(OdrRegistry& r, const std::string& db_path);
+void registry_close(OdrRegistry& r);
+
+// Lista las N funciones mas recientes (ORDER BY updated_at DESC).
+bool registry_list_recent(OdrRegistry& r, int limit,
+                          std::vector<RegistryRow>& out);
+
+// FTS5 search sobre name + description + tags + signature + code.
+bool registry_search(OdrRegistry& r, const std::string& query, int limit,
+                     std::vector<RegistryRow>& out);