OpenZeppelin/canton-stablecoin: docs/stablecoin/PLAN.md

# Plan: MakerDAO-esque Stablecoin CDP System ## Context The `simple-token` module is a minimal CIP-056 token standard implementation with 7 templates, 36 passing tests, and 24 security invariants. It handles UTXO token holdings, transfers (3-way dispatch), allocations (DvP), and all 6 CIP-056 interf