[tobias-tengler]

Fusion creates temporary GraphQL field nodes, name nodes and an array for forwarded variables on each source fetch without entity requirements.

This PR writes those variable names and values directly into the existing request buffer, preserving omission, nulls, order and the requirements fallback.

Method	Version	Mean	Ratio	Allocated	Alloc Ratio
Forward 1 supplied variable, 4 selected	main	0.482 us	1.00	640 B	1.00
Forward 1 supplied variable, 4 selected	PR	0.472 us	0.98	480 B	0.75
Forward 4 supplied variables	main	0.661 us	1.00	856 B	1.00
Forward 4 supplied variables	PR	0.613 us	0.93	512 B	0.60
All 4 selected variables omitted	main	0.428 us	1.00	536 B	1.00
All 4 selected variables omitted	PR	0.431 us	1.01	480 B	0.90
No forwarded variables	main	0.365 us	1.00	416 B	1.00
No forwarded variables	PR	0.376 us	1.03	416 B	1.00

[github-actions]

Patch coverage

100.0% of changed lines covered (21/21)

File	Covered	Changed	Patch %
…/src/Fusion.Execution/Execution/OperationPlanContext.cs	2	2	100.0% 🟢
…/src/Fusion.Execution/Execution/Results/FetchResultStore.cs	19	19	100.0% 🟢

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Project coverage: 59.0% (311473/527774 lines)

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