An agent's make quality runs against no Postgres, so the conftest skips every integration test and coverage collapses far below the 80% threshold — a self-hosted PM read 71% on a suite that is ~96% with a DB and chased it as a code regression. _append_gate_env now injects ROBOCO_TEST_DB_* (host/port/user/password/admin-db) from the orchestrator's own DB settings into each spawn; agents share the Docker network so the host resolves, and the conftest creates throwaway test databases isolated from the live one. The app runtime reads ROBOCO_DATABASE_*, never ROBOCO_TEST_DB_*, so this only feeds the test harness. Gated on toolchain_match_enabled, the faithful-gate flag.