JSON.stringify({id, event: line}) treated the already-JSON `line` as a
plain string, so every event landed in the hub double-encoded (a JSON
string containing escaped JSON, not an object) -- agent-console's
json.Unmarshal into a struct silently failed on every single event.
Now the raw JSON line is spliced directly into the request body.
Also await all in-flight event posts before posting /agent/end, since
those POSTs were fire-and-forget and could reorder past it on the wire.
Hub relays pi's own --mode json session protocol (session/agent_start/
turn_start/message_*/turn_end/agent_end -- the same event shape Claude
Code sessions use) to agent-console over WebSocket, so concurrent pi
runs inside the pod are observable as real transcripts instead of log
tails. agent-run.js wraps `pi -p --mode json` and relays its stdout
lines to the hub; each invocation gets its own session id, so N
concurrent agents show up as N sessions. Source mounted via ConfigMap
and run with `go run .` (no registry yet, same as the pi container).
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