The test:pg-gate suite runs only *.pg.test.ts files, each building/copying a
per-file schema-template database (heavy CREATE/DROP DATABASE DDL serialized by
the single shared Postgres). Worker count derived from CPU cores over-scales on
high-core machines (6 forks on a 28-core box), oversubscribing the one Postgres
until every beforeAll exceeds the 15s hookTimeout (23/23 hook timeouts). CI's
low-core runners stay near 2 forks and pass, so it only bites high-core locals.
Add a maxCap clamp to computeMaxWorkers and a dedicated vitest.pg.config.ts
(maxCap=4) for the pg-gate, right-sizing concurrency to the actual constraint (a
single shared Postgres) rather than raising the timeout (forbidden appeasement).
Low-core machines keep their smaller CPU-derived count via min(4, cpuCap).
Verified: full test:pg-gate now passes 23 files / 126 tests on a 28-core host.
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