Testnet fixtures - Portir

Stock tokens and Venus stock markets do not exist on BSC testnet, so Portir deploys small, non-upgradeable stand-ins. They are never deployed to mainnet.

Contract	Role
`MockUSDT` (tUSDT)	Freely mintable test USDT: `faucet()` gives 10,000, `mint(to, amount)` up to 1M, no cooldown
`TestExchange`	Sells and buys back shares at an EIP-712 quote signed by the keeper; `buyBatch` buys a whole basket in one transaction
`MockStock`	One ERC-20 per featured and basket ticker (20)
`StockLendingPool`	Venus-compatible lending pool over the four loan stocks; real liquidations; close factor 50%, bonus 10%

Quotes

// EIP-712 domain: name "Portir TestExchange", version "1", chainId 97
struct Quote { address stock; uint128 price; uint40 deadline; }

The app (/api/buy) and the agent sign the live mainnet per-share price into every quote, valid for 10 minutes. A quote binds stock, price and deadline only; a real venue must also bind buyer, side and amount (documented as an accepted testnet limitation).