Maity: Board

docs: documented local test environment for the CLI and PostgreSQL

tsk-qahs7p84evrt open chore

Adopted by the maintainer from the jour fixe of 2026-11-02 (round jfx-1fze3cfeq55h, req-wsmx90bt0zyq). Local only, not a test system: how to run the CLI tests and the hub against a local PostgreSQL (e.g. pgserver), with the memory limits of a shared machine (pytest -n at most 2). Files: CONTRIBUTING.md, hub/README.md, cli/README.md.