Memory Vault v1.0.9

Fixes

• Pool checkout validation: AsyncConnectionPool now runs a liveness
  check on checkout, so connections that died while idle are discarded
  and replaced transparently instead of surfacing as query failures.
  Fixes the "server closed the connection unexpectedly" errors common
  on remote-Postgres deployments. (contributed by @hmodes, #118)

• Version reporting: every runtime and release surface now agrees with
  the released tag. /api/health, FastAPI//openapi.json,
  docker-compose.yml, server.json, and memory-vault diagnose all
  report the real installed package version, resolved via
  importlib.metadata. The release workflow now blocks a tag whose
  descriptors drift. (reported by @lcj-codex-coder — Leonard Janke / lcjanke2020, working with GPT-5.6-Sol through OpenAI Codex — #97, fix in #120)

No breaking changes. Upgrade is drop-in.