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//! MoQT client implementation for draft-07.
//!
//! Each draft lives in its own top-level module with a complete, independent
//! implementation: connection, endpoint state machine, event types, observer
//! trait, and per-flow state machines (subscribe, fetch, announce, track
//! status). No code is shared across drafts — each draft carries its own copy
//! because wire-level differences would make a shared layer leaky.
//!
//! Enable via the `draft07` feature.
//!
//! # Differences from later drafts
//!
//! * Request IDs are called **subscribe_id**, allocated monotonically from 0
//! (no client/server parity rule).
//! * Namespace publication uses **ANNOUNCE / UNANNOUNCE** (instead of
//! `PUBLISH_NAMESPACE` which appears in draft-14).
//! * There is no standalone `PUBLISH` flow — publishers announce namespaces
//! and respond to SUBSCRIBE messages.
//! * Subgroup object IDs are **not** delta-encoded, and there are no
//! extension headers. Subgroup/fetch/datagram decoding is stateless.
/// Outbound MoQT connection with MoQT framing over QUIC.
/// Unified endpoint state machine orchestrating all MoQT protocol flows.
/// Client event types emitted via the observer.
/// Fetch lifecycle state machine.
/// Announce / SubscribeAnnounces state machines.
/// Connection observer trait for receiving client events.
/// Session state, setup validation, and subscribe ID allocation.
/// Subscription lifecycle state machine.
/// Track status lifecycle state machine.