Teller MCP Borrow v0.2.3

Highlights\n- Rename ClawHub slug to 'teller-borrow-agents'\n- Borrow-first description; optional delta-neutral mention\n\nSHA-256: a0b04b1d8f260753f65c9295e78a4c883596155bc01f6446407f7f68c1bdd589