0227 — Partition automation is the Janitor loop in Go, not pg_partman

Context. Partition create-ahead, expiry judgment, and dropping need automation; pg_partman is the standard Postgres extension for exactly this.

Decision. No pg_partman, no extensions. Declarative partitioning is core Postgres; pg_partman is only automation around CREATE TABLE ... PARTITION OF and DROP TABLE, and WorkConsumer.Janitor is that same automation, in Go, on a ticker.

Consequences. The system runs on stock Postgres with no extension install or upgrade surface. Partition lifecycle policy (width, TTL, floor) lives in application config next to the code that enforces it, at the cost of owning the automation loop instead of delegating it.