Module execution 

algocline-engine::execution — v2 execution module.

Provides the engine-level session lifecycle machinery:

• SessionRecord — per-session ownership bundle (state, broadcast tx, cancellation token, join handle, response senders).
• SessionRegistryV2 — registry that spawns, tracks, and controls v2 sessions (coexists with the legacy SessionRegistry in session.rs).
• [driver_loop] — background async fn that drives a session to completion, embedding the four cooperative cancellation checkpoints (Crux R2).
• BroadcastObserverHandle — concrete algocline_core::execution::ObserverHandle implementation backed by a broadcast::Receiver<ProgressEvent> (Crux R3).

Design invariants

• Crux R1: No rmcp::*, progressToken, _meta, notifications/*, or mcp_-prefixed identifiers in this module tree.
• Crux R2: Cancellation uses CancellationToken::cancel() only; JoinHandle::abort() and process-kill paths are absent.
• Crux R3: observe() is sync and returns a valid handle even with zero pre-registered observers (sink-free fan-out).

Structs

BroadcastObserverHandle

Wraps a broadcast::Receiver<ProgressEvent> and implements the ObserverHandle trait defined in algocline-core.

SessionRecord

Ownership bundle for a single v2 execution session.

SessionRegistryV2

Registry that manages the lifecycle of v2 execution sessions.