Codifies the rule that every class referenced via `$c->get(X::class)`
inside a container registrar must itself be bound via
`$container->set(X::class, ...)` somewhere — in the same registrar,
in core/App/registerContainer.php, or in a module container
registrar.
Catches the bug pattern from cd2c9c5: a registrar's factory closure
pulled UserSettingsGateway via $c->get() but no matching ->set() ever
ran. Unit tests with mocked dependencies passed; the failure only
surfaced at runtime ("Service not bound: ...") when the affected
admin/settings/user-lifecycle page tried to construct the dashboard
service against the live container.
Implementation is purely static — token / regex parsing of registrar
files plus class_exists() / interface_exists() gating to avoid false
positives on non-class identifiers. No factory invocation, so the
test does not require DB / session / HTTP and is fast.
Verified by reverting the cd2c9c5 binding line in the working tree
and running the test — it produces the exact "UserSettingsGateway
referenced in core/App/Container/Registrars/UserRegistrar.php"
finding. Restored after the dry-run.
Allowlist starts with two framework-bootstrap classes (AppContainer,
ModuleRegistry) that are bound outside the registrar mechanism.
Each future addition needs an inline justification.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
