chore: audit(2026-05) phase 2a slice 10: extract observability concern

[ooples]

Stacked on #1437. Extracts 4 observability Configure methods (Benchmarking, Profiling, Telemetry, GpuDiagnostics). GpuDiagnostics still mutates the process-wide static (preserved pre-refactor semantics). 8/8 tests pass.

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Project	Deployment	Actions	Updated (UTC)
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🤖 PR Title Auto-Fixed

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Original title:
audit(2026-05) phase 2a slice 10: extract observability concern

New title:
chore: audit(2026-05) phase 2a slice 10: extract observability concern

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Version impact: No release

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