Phase 4 verification harness in loadtest/:
- bench-pool.js: standalone dep-free model showing pool of 4 = 4x and
pool of 8 = 8x throughput vs a single serialized connection.
- run.js: autocannon harness for the read path (req/s + p50/p90/p99).
- docker-compose.loadtest.yml + init.sql: seeded Postgres + app read-path
stack (no Prosody) for local load testing.
- README.md: usage and staging validation checklist.
Part-of: <http://gitlab.vnc.biz/uxf/prosody-muc-rest/-/merge_requests/3>
