Holistic-review fixes for integration gaps the per-commit reviews missed:
- CI now runs `pnpm run test:snapshot` (a step after the coverage gate). It was
wired into pre-push but not .github/workflows/ci.yml, so the RFC/AGENTS claim
that snapshot replay runs in the default PR gate was only half-true — CI is
the real gate.
- vitest.snapshot.config.ts loads the repo .env ONLY when DSH_SNAPSHOT=record.
Loading it unconditionally contradicted the replay safety story (replay must
never reach the network), and runScenario forwards process.env to the child.
Non-ENOENT load errors now surface instead of being swallowed.
- start.ts: the graceful-shutdown comment said "RECORD runs" but the path
applies to both snapshot modes (replay also closes stdin → dispose → exit).
- docs/development.md: list the new pre-push snapshot job and the CI snapshot
gate.