docs: fix incorrect dev DB reset path in AGENTS.md

The embedded PostgreSQL data directory moved to ~/.paperclip/instances/default/db
but AGENTS.md still referenced the old data/pglite path.

Co-Authored-By: Paperclip <noreply@paperclip.ing>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

AGENTS.md

@@ -61,7 +61,7 @@ curl http://localhost:3100/api/companies
 Reset local dev DB:
 
 ```sh
-rm -rf data/pglite
+rm -rf ~/.paperclip/instances/default/db
 pnpm dev
 ```