5.pipeline

How every Channel owns a pipeline of handler contexts and how initial handlers are installed.

Dynamic pipeline modification, handler lifecycle callbacks, event-loop serialization, and sharability constraints.

Propagation of channel lifecycle and read events through inbound handlers.

Propagation of writes, flushes, binds, connects, closes, and other outbound operations through handlers toward the transport.

How handler failures become exceptionCaught events and why exceptions need explicit logging, cleanup, and connection policy.