SSE clients (agents_dashboard) consider the stream connected only after
receiving the first byte of body. The previous implementation flushed
headers and then blocked waiting for status diffs (sse_status) or log
lines (sse_agents_logs) — which could be silent for minutes. UI sat
on "connecting" indefinitely.
Fix:
- After WriteHeader + Flush, emit ":ping\n\n" comment (SSE spec, valid
no-op) and flush. Unblocks client fgets immediately → state flips
to "connected" in < 1s.
- Add 15s ticker emitting ":ping\n\n" so idle streams stay alive
through Traefik / CDN proxies and clients detect dead servers.
- Same treatment for /sse/status and /sse/agents/{id}/logs (tail.go).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
egutierrez
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