deferred-queue-processor-not-verified-at-enqueue-time

Phase 3.7 of session-close appends jobs to ~/.claude/deferred-queue.jsonl (Graphiti ingestion, wiki-lint, OpenAgents posting) but does not verify the cron processor is actually running and draining the queue. Jobs can accumulate silently across sessions with no feedback. Should add a cron liveness check (crontab -l grep + last-drain timestamp) before enqueuing.