Run Context

RunContext is the mutable run-scoped workspace derived from a persisted Thread.

Responsibilities

• Track run-time messages and patches
• Expose immutable snapshots of current state (snapshot, snapshot_of, snapshot_at)
• Emit incremental run delta via take_delta()
• Carry run identity and version cursor

Common Calls

• RunContext::from_thread(thread, run_policy)
• messages() / add_message(...)
• add_thread_patch(...)
• take_delta()
• has_delta()
• suspended_calls()