dangernoodle-io / breadboard / 24964010818

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fix(bb_log): periodic SSE keepalive so dead connections surface (#94)

The /api/logs SSE stream sent ': connected' once at open and then
nothing while the ring buffer was idle. Browsers (and intermediate
NATs / wifi roams) saw the connection as alive indefinitely; clients
got stuck in 'Connected' state receiving no data, and dead peers held
the single SSE slot until something else forced an error.

Send a `: ping` comment frame after ~10s of silence in the drain loop.
EventSource ignores comment lines, but the chunk write surfaces a dead
peer immediately so sse_task can clean up — and clients can use the
keepalive cadence to detect a stalled stream.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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