fix(adapter): Address enum defaults, partial types, ordering, and DIM filtering

[Copilot]

Fixes 6 issues identified in PR #108 review affecting code generation correctness and determinism.

Changes

• Enum default parameters: Emit MyEnum.Value syntax instead of numeric literals (0), preventing invalid C# like MyEnum x = 0
• Partial type conflicts: Allow user-defined partial declarations to extend generated adapters; only error on non-partial conflicts
• Member ordering: Remove file paths from ordering logic to ensure deterministic output across build environments
• Constructor accessibility: Handle ProtectedAndInternal (private protected) constructors when validating abstract class targets
• Default interface members: Filter out C# 8.0+ default implementations from required member list (they don't need adapter implementations)
• Code clarity: Simplify LINQ filtering and combine duplicate accessibility checks

Example

Before, enum parameters generated invalid code:

void Method(MyEnum option = 0)  // ❌ Invalid C#

After, proper enum syntax is emitted:

void Method(MyEnum option = global::MyNamespace.MyEnum.Default)  // ✅ Valid

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[Copilot]

Pull request overview

This PR addresses six correctness and determinism issues identified in PR #108 review, improving the reliability and quality of the Adapter pattern generator's code output.

Changes:

• Fixed enum default parameter generation to emit proper C# syntax (MyEnum.Value instead of numeric literals)
• Enhanced type name conflict detection to allow user-defined partial type declarations
• Removed file paths from member ordering logic to ensure deterministic builds across different environments
• Extended constructor accessibility validation to handle private protected (ProtectedAndInternal) constructors
• Filtered out C# 8.0+ default interface member implementations from the required member list
• Simplified LINQ filtering for better code readability

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