Fix ChunkedArrayWriter position at exact chunk boundaries

[michaelstaib]

No description provided.

[Copilot]

Pull request overview

This PR fixes how ChunkedArrayWriter.Position is computed when the writer is exactly at a chunk boundary (i.e., _currentChunkOffset == BufferSize), ensuring the reported position/length reflects the correct flat byte count instead of losing the carry into the next chunk.

Changes:

• Fix ChunkedArrayWriter.Position to use arithmetic addition instead of bitwise OR so chunk-boundary positions carry correctly.
• Add regression tests to validate Position/Length at exact chunk boundaries and that captured boundary positions can be used to address subsequently written bytes (including via the scratch-buffer path).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/HotChocolate/Utilities/test/Utilities.Tests/ChunkedArrayWriterTests.cs	Adds regression coverage for Position and addressing correctness at exact chunk boundaries.
src/HotChocolate/Utilities/src/Utilities.Buffers/ChunkedArrayWriter.cs	Fixes Position computation so boundary offsets correctly increment the flat cursor.

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[github-actions]

Patch coverage

100.0% of changed lines covered (1/1)

File	Covered	Changed	Patch %
…/Utilities/src/Utilities.Buffers/ChunkedArrayWriter.cs	1	1	100.0% 🟢

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Project coverage: 54.5% (243355/446634 lines)