Customers module
The first module to ship. Customer search, ledger, per-section edit popups, archive/reactivate, loyalty, PIPA export/erase.
Settings module
The admin surface — users + staff management, read-only permissions matrix, shop config.
Modules
The business bricks. Each module is a self-contained tab — markup + client JS + API + SQL — that registers itself with the Kernel. Nothing in a module knows about another module.