- add `io: std.Io` field to JetstreamClient and FirehoseClient - subscribe() returns Io.Cancelable!void (enables async cancellation) - replace libc.nanosleep() with io.sleep() for reconnect backoff - pass caller-provided io to websocket.Client.init() instead of debug_io - fix bug: firehose connectAndRead() was missing required `io` param - bump version to 0.3.0-alpha.6 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>