Backend conventions

The backend conventions, as the Evolve team gives them to coding agents. See Conventions for how to install them.

Convention	What it covers
add-payment-provider	Add a payment provider (PSP) to an Evolve commerce backend.
evolve-vendor-checkouts	Work on @evolve-framework, @evolve-storefront or evolve-contrib packages from inside an Evolve project, through `task vendor-evolve`, which links a checkout under `vendor/` into the workspace.