chore(serve): downgrade per-session publish and hub unsubscribe logs to Debug

These fire on every statusline dump (multiple/sec during active
sessions) and on every tab close / SSE reconnect respectively — too
chatty for normal operation at Info level. Global-quota publishes
stay at Info since rate-limit buckets only shift every few minutes.

Useful diagnostic signal is preserved: flip the daemon to Debug
when needed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: aksOps

internal/serve/events/hub.go

@@ -282,7 +282,10 @@ func (h *Hub) removeSub(s *Sub) {
 	delete(h.subs, s)
 	remaining := len(h.subs)
 	h.mu.Unlock()
-	slog.Info("hub unsubscribe",
+	// Debug-level: tab closes, navigations, and fetch-event-source
+	// reconnects all produce unsubscribes. Watching these at Info is
+	// too chatty for normal operation.
+	slog.Debug("hub unsubscribe",
 		"filter", s.filter, "dropped", s.dropped.Load(),
 		"subscribers_after", remaining)
 }

internal/serve/ingest/quota.go

@@ -310,7 +310,11 @@ func (q *QuotaIngester) publishSession(name string) {
 		"output_tokens": s.outputTokens,
 		"cache_tokens":  s.cacheTokens,
 	})
-	slog.Info("quota publish session",
+	// Debug-level: fires on every statusline dump where any token
+	// field changed, which during active sessions is multiple times a
+	// second. Global-quota publishes stay at Info — they only move
+	// when rate-limit buckets actually shift.
+	slog.Debug("quota publish session",
 		"session", name, "context_pct", s.contextPct,
 		"input", s.inputTokens, "output", s.outputTokens, "cache", s.cacheTokens)
 	q.hub.Publish(events.Event{Type: "quota_update", Session: name, Payload: body})