//! End-to-end session message handlers.
//!
//! Handles locally-delivered session payloads from SessionDatagram envelopes.
//! Dispatches based on FSP common prefix phase to specific handlers for
//! SessionSetup (Noise XK msg1), SessionAck (msg2), SessionMsg3 (msg3),
//! encrypted data, and error signals (CoordsRequired, PathBroken).
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