Update comparison tables for protocol parsing (tracing, MIME headers, INFO caching, Span-based MSG), subscriptions (generation ID, Stats, SubjectsCollide, token utils, account limits), auth (deny enforcement, LRU cache, response permissions, auth expiry), configuration (CLI flags, MaxSubs, Tags, file logging), and logging (trace/debug modes, file output). Mark 11 summary items as resolved.
Reconcile close reason tracking: feature branch's MarkClosed() and ShouldSkipFlush/FlushAndCloseAsync now use main's ClientClosedReason enum. ClosedState enum retained for forward compatibility.
