Add internal directive support to Fusion schema types

[michaelstaib]

No description provided.

[github-actions]

Patch coverage

94.8% of changed lines covered (219/231)

File	Covered	Changed	Patch %
…/Fusion/src/Fusion.Execution.Types/FusionDirective.cs	9	12	75.0% 🔴
…/src/Fusion.Execution.Types/FusionDirectiveDefinition.cs	9	12	75.0% 🔴
…/Collections/FusionDirectiveCollection.cs	164	170	96.5% 🟡
…/src/Fusion.Execution.Types/Completion/CompletionTools.cs	8	8	100.0% 🟢
…/Fusion.Execution.Types/Completion/CompositeSchemaBuilder.cs	27	27	100.0% 🟢
…/src/Fusion.Execution.Types/Directives/DirectiveTools.cs	2	2	100.0% 🟢

Uncovered changed lines (JSON)

{
  "sha": "bda4258f2e2f00b7d06cfcfb566b467eb411dc5d",
  "files": [
    { "path": "src/HotChocolate/Fusion/src/Fusion.Execution.Types/FusionDirective.cs", "ranges": [[25, 27]] },
    { "path": "src/HotChocolate/Fusion/src/Fusion.Execution.Types/FusionDirectiveDefinition.cs", "ranges": [[145, 147]] },
    { "path": "src/HotChocolate/Fusion/src/Fusion.Execution.Types/Collections/FusionDirectiveCollection.cs", "ranges": [[85, 85], [351, 351], [388, 388], [405, 407]] }
  ]
}

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Project coverage: 53.8% (231057/429810 lines)

[Copilot]

Pull request overview

Adds first-class handling for “internal” directive applications in Fusion schema types, with special handling to normalize composed @fusion__tag into a public @tag directive definition while keeping tag applications optionally hidden from the default directive view.

Changes:

• Normalize composed @fusion__tag directive definitions to @tag and map @fusion__tag applications to internal @tag applications during schema completion.
• Introduce internal/public partitioning for FusionDirectiveCollection (default view shows only public directives; WithInternals exposes all).
• Add test coverage for tag normalization/visibility and directive collection partition semantics.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/HotChocolate/Fusion/test/Fusion.Execution.Tests/Execution/Types/FusionTagDirectiveTests.cs	Adds end-to-end tests validating tag normalization and internal/public visibility across schema elements.
src/HotChocolate/Fusion/test/Fusion.Execution.Tests/Execution/Types/FusionDirectiveCollectionTests.cs	Adds unit tests validating stable partitioning and API behavior for directive collections with internals.
src/HotChocolate/Fusion/src/Fusion.Execution.Types/FusionDirectiveDefinition.cs	Adds support for directives applied to directive definitions and completion-time sealing.
src/HotChocolate/Fusion/src/Fusion.Execution.Types/FusionDirective.cs	Adds per-application visibility (IsPublic) and constructor overload to support internal directives.
src/HotChocolate/Fusion/src/Fusion.Execution.Types/FusionBuiltIns.cs	Adds fusion__tag built-in name constant.
src/HotChocolate/Fusion/src/Fusion.Execution.Types/Directives/DirectiveTools.cs	Stops filtering out fusion__tag so it can be retained and normalized.
src/HotChocolate/Fusion/src/Fusion.Execution.Types/Completion/CompositeSchemaBuilder.cs	Preserves/normalizes fusion__tag directive definitions into tag and completes directive-definition directives.
src/HotChocolate/Fusion/src/Fusion.Execution.Types/Completion/CompletionTools.cs	Maps fusion__tag applications to internal tag applications when building directive collections.
src/HotChocolate/Fusion/src/Fusion.Execution.Types/Collections/FusionDirectiveCollection.cs	Implements public/internal partitioning, adds WithInternals view, and updates collection semantics accordingly.

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