Bounds the connect-time onboarding summary burst (Feature 1). Hard-capped at 5 and clamped (negative->0, >cap->cap) so onboarding can never bulk-fetch; 0 disables. The cap bounds COUNT only — every fetch still flows through the shared caption rate gate (ADR-014). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>