0.8.0

Changes

• Bump the minimum dependencies to Clojure 1.12 and ClojureScript 1.12.
• Bump http-kit to 2.8.1 and (dev-only) piggieback to 0.6.0.
• The REPL client now talks over the platform's native WebSocket instead of
  the legacy goog.net.WebSocket / clojure.browser.net machinery. As a
  result the client runs in any modern JavaScript runtime (browsers, Node 22+,
  Deno, Bun, web/service workers), not just the browser. Two consequences worth
  calling out:
  • The weasel.impls.websocket namespace, previously a goog.net-based
    protocol implementation, is now a small functional wrapper. Code that
    depended on its old vars (websocket-connection, the IConnection
    protocol, etc.) needs updating.
  • The objects passed to the :on-error and :on-close callbacks are now
    native WebSocket events rather than goog.net.WebSocket events.

Enhancements

• The client now reconnects automatically when the connection drops (page
  reload, server restart, flaky network) using an exponential backoff. It is
  on by default and tunable via the :reconnect?, :reconnect-delay and
  :max-reconnect-delay options. Call weasel.repl/disconnect to close the
  connection and stop reconnecting.
• Added an optional application-level heartbeat (:ping/:pong) that detects a
  silently dead connection and triggers a reconnect. It is off by default and
  enabled via the :heartbeat-interval option; it never disrupts a server that
  doesn't answer pings.
• The server no longer rejects a second client. Several clients may be connected
  at once; evaluations go to the most recently connected one (so a new client
  takes over the REPL) while the others stay connected and their output still
  reaches the REPL. An evaluation whose target client disconnects mid-flight now
  reports an error instead of hanging the REPL.
• The server now validates the Origin header of incoming WebSocket
  connections. By default only local origins (localhost, 127.0.0.1, [::1])
  are accepted, closing a hole where any page open in the developer's browser
  could connect to the REPL. Use the new :allowed-origins repl-env option (a
  collection of origins, a predicate, or :all) to widen it. Non-browser
  clients send no Origin header and are unaffected.
• Ship a deps.edn so the library can be consumed via the Clojure CLI / tools.deps.
• Add a GitHub Actions CI pipeline and a basic test suite, including a Node
  round-trip integration test that exercises the full eval cycle over a real
  WebSocket.