Module session 

Session layer for flow control and channel management. Session layer that wraps a Transport and enforces RPC semantics.

The Session handles:

• Per-channel credit tracking (flow control)
• Channel state machine (Open → HalfClosedLocal/Remote → Closed)
• Cancellation (marking channels as cancelled, dropping late frames)
• Deadline checking before dispatch
• Control frame processing (PING/PONG, CANCEL, CREDITS)

Structs

ChannelState

Per-channel state tracked by the session.

Session

Session wraps a Transport and enforces RPC semantics.

Enums

ChannelLifecycle

Channel lifecycle state.

Constants

DEFAULT_INITIAL_CREDITS

Default initial credits for new channels (64KB).