Replace generic Core PHP Framework boilerplate with package-specific
documentation covering the vendor tracking module's architecture,
services, and commands.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Aligns module namespace with Core PHP Framework conventions where
modules live under the Core\Mod\ namespace hierarchy. This follows
the monorepo separation work started in 40d893a.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>