Consolidates the native-transport half of PR #73636 by @ScaleLeanChris
onto the merged adapter: persistent NIP-42-authenticated Nostr WebSocket
subscription as the default inbound path (transport=auto|websocket|poll),
kind-44100 membership events for live DM discovery, since-timestamp
resume on reconnect with bounded exponential backoff, and automatic
fallback to CLI polling when the WS can't be established. Events route
through the same _handle_event() pipeline as the poll loop, so de-dupe,
mention gating, p-tag DM latching, and allow-lists behave identically on
both transports. Outbound stays on the CLI (one-shot sends never race a
WS auth handshake — his design).
E2E verified against a real in-process websockets relay: NIP-42
challenge -> signed kind-22242 AUTH (event id re-derived server-side) ->
REQ subscription -> EVENT dispatch -> clean disconnect.
Co-authored-by: ScaleLeanChris <chris@scalelean.com>
