Backend: GET /fleet/jobs/:id/events/stream emits a snapshot (seq > Last-Event-ID)
then long-polls the append-only event log, closing after a bounded window so
EventSource-style clients reconnect cleanly. Honors Last-Event-ID resume,
keepalive comments, and a terminal error frame.
Frontend: subscribeJobEvents uses fetch streaming (to send auth + product
headers) with parseSseFrames, Last-Event-ID resume, reconnect backoff, and a
fatal-on-error-frame fallback to polling. Job detail page subscribes live
(deduped by seq), falls back to 4s polling on failure, and shows a Live badge;
refresh() now merges events so a slow snapshot can't clobber streamed ones.
Tests: +3 route (snapshot, resume cursor, append-after-connect), +5 client
(parseSseFrames x2, subscribe deliver/error/resume/error-frame). fleet 150, web 222.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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