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Summary

Two improvements bundled together (Tasks 9/5):

Task 10 — Forward Progress: GenerativeNestedTypesTests.fs

Adds 5 focused tests for generative type providers that host nested provided types:

The provider sets up a Library container with two nested classes (Book, Shelf), each with fields, constructors, instance/static properties, and instance methods.

Task 5 — Coding Improvement: canBindNestedType in ProvidedTypeDefinition

GetNestedTypes and GetMembers on ProvidedTypeDefinition previously filtered nested types using the inconsistent condition:

memberBinds true bindingFlags false m.IsPublic || m.IsNestedPublic

Because || m.IsNestedPublic is appended outside the memberBinds call, a nested public type (IsNestedPublic = true) was always included regardless of BindingFlags — e.g. even when only BindingFlags.NonPublic was set.

The canBindNestedType utility (already used in TypeSymbol.GetNestedTypes and TargetTypeDefinition.GetNestedTypes) correctly handles this:

hasFlag bindingFlags BindingFlags.Public && c.IsNestedPublic ||
hasFlag bindingFlags BindingFlags.NonPublic && not c.IsNestedPublic
```

This PR replaces the two inconsistent uses with `canBindNestedType`, making the behaviour consistent and correct.

## Test Status

```
Passed!  - Failed: 0, Passed: 157, Skipped: 0, Total: 157, Duration: 7 s

All 157 tests pass (152 before + 5 new GenerativeNestedTypesTests).

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