feat(@23blocks/react): rebuild with provider field for prompts and agents

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Juan Pelaez

packages/react/src/lib/index.ts

@@ -1,5 +1,5 @@
 // ─────────────────────────────────────────────────────────────────────────────
-// Main API (Recommended) — token lifecycle, auto-refresh, 401 retry, Mistral vendor support, generic vendorModels API
+// Main API (Recommended) — token lifecycle, auto-refresh, 401 retry, provider field on prompts/agents, Mistral vendor support
 // ─────────────────────────────────────────────────────────────────────────────
 export {
   // Main exports