fix: downgrade EOSE unknown subscription warning to trace

Live subscriptions (limit:0, no auto-close) are not tracked in
PendingBatch because they stay open indefinitely for new events.
When they receive EOSE (immediately, since no historic events),
handle_eose can't find them in outstanding_subs.

This is expected behavior, not an error. Changed log level from
warn to trace to reduce noise.

Observed in production logs: sync_live() subscriptions with limit:0
complete immediately and trigger this path.

Issue: work/active-issues/eose-unknown-subscription.md

0 files changed, 0 insertions, 0 deletions