* p2p: Use JSServer for comms rather than GoJsConn
This has several benefits:
- it fixes a bug whereby you could not transmit >4k bytes to/from JS/Go land.
- it more clearly exposes the interface point between Go and JS: a single
global function call.
- it presents a nicer API shape than the previous `net.Conn`.
- it doesn't needlessly 'stream' data which is already sitting in-memory.
This is currently only active for local CS API traffic, another PR will
add Federation P2P support.
* Typo
