[Fusion] Add depth limit to satisfiability validator

[glen-84]

Summary of the changes (Less than 80 chars)

• [Fusion] Add depth limit to satisfiability validator.

[Copilot]

Pull request overview

Adds a recursion depth guard to Fusion’s satisfiability validation to prevent stack overflows on large/cyclic schemas, with a regression test to cover the scenario.

Changes:

• Introduce a maximum recursion depth check in SatisfiabilityValidator.VisitObjectType.
• Track current traversal depth in SatisfiabilityValidatorContext.
• Add a stress/regression test that builds a large cyclic type graph across multiple schemas and asserts validation completes successfully.

Reviewed changes

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

File	Description
src/HotChocolate/Fusion/src/Fusion.Composition/SatisfiabilityValidator.cs	Adds depth tracking and a hard cutoff to avoid runaway recursion/stack overflow during satisfiability validation.
src/HotChocolate/Fusion/test/Fusion.Composition.Tests/SatisfiabilityValidatorTests.cs	Adds a test that constructs a large type cycle across multiple schemas to ensure validation doesn’t stack overflow.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

Files not reviewed (1)

• src/HotChocolate/Fusion/src/Fusion.Composition/Properties/CompositionResources.Designer.cs: Language not supported

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (89150fc) to head (06a6220).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #9486   +/-   ##
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