Node has no EventSource, so the live-update stream is read as raw bytes and
decoded here. Three details are what the parser exists for: a TCP read can end
between the CR and the LF of a CRLF, so a trailing CR is held back rather than
dispatched; the tunnel padding the server appends after a frame is a comment
with no blank line after it and must not split anything; and the keepalive is a
NAMED event, because an SSE comment is invisible to a browser client by spec.
Event classification lives here too, as a set rather than a prefix test:
`session:terminal` is most of the stream and the preview pane pulls its own
tail, so it is deliberately not a resync trigger.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
