reinhardt-testkit 0.1.0

Core testing infrastructure for Reinhardt framework (no functional crate dependencies)
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# reinhardt-testkit

Core testing infrastructure for the Reinhardt framework.

## DI mock fixtures

`reinhardt-testkit` exposes three layers for mocking DI dependencies in tests:

1. `with_di_overrides!` macro (most ergonomic)
2. `DiOverrideBuilder` + `injection_context_with_di_overrides` (closure form)
3. `injection_context_with_overrides` (legacy; scope-seeding only)

```rust,no_run
use reinhardt_testkit::with_di_overrides;
use rstest::*;
use serial_test::serial;

#[rstest]
#[serial(di_registry)]
#[tokio::test]
async fn example() {
    let (ctx, _di) = with_di_overrides! {
        singleton Config { url: "test".into() },
    };
    // Use `ctx` as your test InjectionContext.
}
```

See `instructions/TESTING_STANDARDS.md` (the TI- entry about `with_di_overrides!`) for the full rule set.