docs(#2290): update mcp_sockets module doc — no eager register_agent after converge cleanup

hive-c0re/src/workers/mcp_sockets.rs

@@ -7,9 +7,10 @@
 //!
 //! Same shape as `agent_sockets::spawn_poll` — a simple 10 s tick loop that
 //! converges "agent container running ⇒ MCP listener bound". The self-healing
-//! guarantee means the start path no longer needs to call `register_agent`
-//! directly (though spawn still does for eagerness); callers only need
-//! `lifecycle::ensure_agent_runtime_dir` to create the bind-mount source.
+//! guarantee means no callsite needs to call `register_agent` directly;
+//! `lifecycle::ensure_agent_runtime_dir` (called inside `lifecycle::spawn`
+//! and `converge_start_preamble`) creates the bind-mount source, and the
+//! reconcile loop picks up the listener binding on the next tick.
 
 use std::sync::Arc;