Generated .g.cs files were emitted without an auto-generated marker and could surface compiler warnings from generated code. This updates emitted source to include standard generated-file metadata and warning suppression, plus attribution to the generator and target method.

• Generated file preamble

  • Added an explicit preamble to all generated method files:
    • // <auto-generated/>
    • generator attribution including target method name
    • #pragma warning disable
  • Implemented in GeneratesMethodPatternSourceBuilder.AppendNamespaceAndTypeHeader(...) so it applies consistently across simple, switch, and fluent generation paths.

• Generator attribution in output

  • Emitted metadata now includes:
    • generator type: EasySourceGenerators.Generators.GeneratesMethodGenerator
    • generated method name (e.g., GetBoolLabel)
  • This makes origin tracing straightforward in generated artifacts.

• Tests updated with focused coverage

  • Added a targeted assertion that generated code includes:
    • auto-generated marker
    • generator/method attribution
    • warning suppression pragma
  • Enhanced GeneratedCodeTestHelper with:
    • ReadGeneratedCodeRaw(...) for header-level assertions
    • preamble stripping in ReadGeneratedCode(...) to keep existing exact-content tests stable.

// <auto-generated/>
// Generated by EasySourceGenerators.Generators.GeneratesMethodGenerator for method 'GetBoolLabel'.
#pragma warning disable

namespace EasySourceGenerators.Tests;

• Fixes Generated code should not produce warnings #50

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