docs: point agents to master context

[chapati23]

Summary

• Add a root AGENTS.md pointer to the private mento-master-context router.
• Keep this repo as source of truth for local implementation details while routing cross-protocol questions to the compact context index first.

Validation

• git diff --check
• local autoreview helper: no deterministic findings
• commit/push hooks ran where configured

Ship Checklist

• ship skill used
• local review run
• validation run

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Note

Low Risk
Documentation-only change with no runtime, security, or application logic impact.

Overview
Introduces a new root AGENTS.md with instructions for AI agents working in the Mento CLI repo.

Agents are told to consult the private mento-master-context router at ../mento-master-context/.agents/mento-context/README.md first for cross-protocol topics (contracts, deployments, addresses, ABIs, on-chain state, reserves, docs, legal/risk, etc.), instead of doing wide searches in this repo alone. They should load only relevant context cards, then return here for CLI implementation.

The doc also clarifies scope: this repository remains the source of truth for CLI behavior; deployment addresses, ABIs, and live chain state should come from deployments-v2 and RPC as master context directs, with answers noting which card was used or that the checkout was unavailable.

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