Add comprehensive integration tests verifying that post comment_count is correctly reconciled when comments arrive before their parent post due to out-of-order Jetstream event delivery. Test coverage: - Single comment arrives before post - count reconciled to 1 - Multiple comments arrive before post - count reconciled correctly - Mixed ordering (comments before and after post) - count accurate - Idempotent post indexing preserves comment_count Also update misleading FIXME comment in comment_consumer.go to accurate NOTE explaining that reconciliation IS implemented in post_consumer.go at lines 210-226. Fixes issue: Post comment_count Never Reconciles File: internal/atproto/jetstream/comment_consumer.go:362