feat(escrow): implement relayer staking collateral escrow (sdk 20 com…#313
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…patible) - Add deposit_stake, withdraw_stake, get_stake, initialize functions - Integrate SAC token via token::TokenClient - Fix sdk 20 compatibility: TokenClient, register_contract, register_stellar_asset_contract - Apply checks-effects-interactions pattern in withdraw_stake - Full test suite with mock_all_auths
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Summary
Implements Issue #259 — Automated Relayer Staking Collateral Escrow
Changes
initialize(env, token)— stores SAC token address in instance storagedeposit_stake(env, relayer, amount)— pulls tokens from relayer into escrowwithdraw_stake(env, relayer, amount)— returns tokens to relayer with auth checkget_stake(env, relayer)— returns current staked balanceSDK Compatibility (soroban-sdk 20.0.0)
token::TokenClient(not TokenClient v21 variant)env.register_contract()andregister_stellar_asset_contract()register,_v2variants)Security
require_auth()on all state-changing functionswithdraw_stakeTesting
mock_all_auths()applied correctlyCloses #259