v1.6.8

Improvements

• Bounded worker pool: Default worker count reduced from CPU count to 10, limiting concurrent Neo4j connections and reducing 502 Bad Gateway bursts under load.
• Request queuing: Max concurrent queries reduced from workers×4 to workers×2. Requests exceeding the limit are queued and held open until a worker becomes available — no request is dropped.
• Queue monitoring: New GET /status endpoint returns live queue depth (active, waiting, total_served, workers, max_concurrent).
• Queue logging: Every incoming request now logs (active=N waiting=N) for backpressure visibility.
• All settings remain configurable via VFBQUERY_WORKERS and VFBQUERY_MAX_CONCURRENT env vars or CLI flags.