v0.1.4

Rust v4.0.21 parity fixes for the Node.js SDK.\n\nHighlights:\n- Tightens SWQOS sender/provider request handling and signature validation.\n- Preserves provider-specific options such as Helius swqosOnly and Astralane/Node1 transports.\n- Aligns multi-SWQOS durable nonce behavior and improves failed-submit diagnostics.\n- Updates tests and README parity notes.