Postgres Adopt

The engine is the brain's foundation: PGLite is the zero-config floor, Postgres is where concurrency, multi-machine access, and 1000+ pages live. This skill answers "which one am I on?", prefers Postgres when the operator wants it, and moves data safely — never by flipping config.

Contract

This skill guarantees:

• Detection is engine-free and read-only: gbrain engine status --json answers with the database down (that is the point of the command).
• Engine changes NEVER happen by editing config. Moving data uses gbrain migrate --to <supabase|pglite> — which brings its own guardrails (quiesce mutex, resume manifest, non-empty-target guard, and a config flip only on a fully clean run). This skill wraps it; it never reimplements it.
• Provisioning consent is explicit: the docker rung needs --allow-docker, creating a database on a local server needs --allow-create-db. Headless mutation of infrastructure the operator didn't opt into never happens.