Fix Fusion defer patches when delivery path crosses intermediate lists

[michaelstaib]

No description provided.

[Copilot]

Pull request overview

This PR fixes Fusion @defer incremental patch generation when the delivery path traverses one or more intermediate list fields, ensuring the pending path stops at the first list boundary and the emitted patches use subPath to address concrete list elements.

Changes:

• Compute per-delivery-group “pending paths” that stop at the first list field, plus metadata used to build correct subPath values.
• Rework incremental result creation to recursively emit patches for descendants under list elements (field/index subPath segments).
• Add a regression test and snapshot covering defer delivery across intermediate lists.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/HotChocolate/Fusion/src/Fusion.Execution/Execution/OperationPlanExecutor.cs	Introduces delivery-path computation and updates incremental patch emission to correctly handle paths that cross list boundaries.
src/HotChocolate/Fusion/test/Fusion.AspNetCore.Tests/DeferTests.cs	Adds a regression test covering @defer delivery when the path crosses intermediate lists.
src/HotChocolate/Fusion/test/Fusion.AspNetCore.Tests/__snapshots__/DeferTests.Defer_Should_Return_Patches_When_Path_Crosses_Intermediate_Lists.yaml	Captures the expected stable-stream response shape (pending path + per-element incremental patches).

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Patch coverage

64.4% of changed lines covered (130/202)

File	Covered	Changed	Patch %
…/src/Fusion.Execution/Execution/OperationPlanExecutor.cs	130	202	64.4% 🔴

Uncovered changed lines (JSON)

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Project coverage: 54.3% (242044/445363 lines)