public_api.rs imported only spec §3's original list (S15). It now also
probes WallClockStore, Node::set_wall_clock, Node::peer_time_estimate and
Node::flush (decision H), the Node method signatures, the NodeEvent shape
and the public wire constants, and names nothing §3 makes private
(Frame, WireError, local constants).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>