docs: point agents to master context

AGENTS.md

@@ -0,0 +1,20 @@
+# Mento CLI Instructions
+
+For any protocol-level question that crosses beyond this CLI repo, first read
+the private `mento-master-context` router when the checkout is available:
+
+```text
+../mento-master-context/.agents/mento-context/README.md
+```
+
+This applies before broad repo searches for contracts, deployments, addresses,
+ABIs, live on-chain state, stable supply, reserve data, monitoring/data
+semantics, docs, the whitepaper, business model, or legal/risk framing. Load
+only the relevant master-context card(s), then return to this repo for CLI
+implementation details.
+
+This repo is source of truth for CLI behavior, not for published deployment
+addresses, generated ABIs, or current chain state. Resolve those through
+`deployments-v2` and live RPC as routed by master context. When answering,
+mention which master-context card you used or state that the checkout was
+unavailable.