Auto-Failover SDK for Zcash lightwalletd — Multi-endpoint resilience for wallets & apps

# Zcash Community Grants - Grant Application ## Auto-Failover SDK for Lightwalletd Multi-Endpoint Resilience ## Terms and Conditions - [x] I agree to Grant Agreement terms if funded - [x] I agree to provide KYC if funded above $50,000 USD - [x] I agree to disclose conflicts of in