Mark generated source as auto-generated and suppress warnings in .g.cs output

[Copilot]

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;

Original prompt

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This section details on the original issue you should resolve

<issue_title>Generated code should not produce warnings</issue_title>
<issue_description>Generated code files should be clearly marked as automatically generated, hence suppress common warnings.

Maybe also reference this package as the generator?
And maybe even the method that generated this code?</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Generated code should not produce warnings #50

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✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

Updates the GeneratesMethod source generator output to be clearly identified as generated code and to suppress compiler warnings in emitted .g.cs files, improving build signal quality and traceability of generated artifacts.

Changes:

• Adds a standard generated-file preamble (// <auto-generated/>, generator + target method attribution, and #pragma warning disable) to generated method sources.
• Extends the test helper to support reading raw generated output vs. preamble-stripped output for stable existing assertions.
• Adds a targeted test asserting the generated preamble exists in produced output.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
EasySourceGenerators.Tests/GeneratedCodeTestHelper.cs	Adds raw read + preamble stripping to keep existing exact generated-code assertions stable.
EasySourceGenerators.Tests/BoolSwitchKeyTests.cs	Adds an assertion-focused test validating the new generated-file preamble.
EasySourceGenerators.Generators/GeneratesMethodPatternSourceBuilder.cs	Emits auto-generated marker, attribution, and warning suppression at the top of generated sources.

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