[Tasks] Refactor NVIDIA hardware specs with typed compute capabilities

[julien-c]

Summary

• Complete NvidiaComputeCapabilities enum with all 15 architectures (Blackwell Ultra through Maxwell)
• Extract NvidiaHardwareSpec, NvidiaComputeCapabilities, and NVIDIA_SKUS into a dedicated hardware-nvidia.ts file
• Type NVIDIA_SKUS as Record<string, NvidiaHardwareSpec> with required computeCapability

Test plan

• TypeScript compiles cleanly (npx tsc --noEmit)
• Verify downstream consumers of SKUS.GPU.NVIDIA still work as expected

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Note

Medium Risk
Moderate risk due to a public type/API surface change: computeCapability is no longer part of generic HardwareSpec, so downstream TypeScript consumers may need updates even though runtime SKU data is unchanged.

Overview
Moves the NVIDIA GPU SKU table out of hardware.ts into a new hardware-nvidia.ts, introducing NvidiaHardwareSpec (with required computeCapability) and a completed NvidiaComputeCapabilities enum.

Updates hardware.ts to reference NVIDIA_SKUS for SKUS.GPU.NVIDIA and removes computeCapability from the generic HardwareSpec interface, and re-exports the new NVIDIA-specific type from index.ts.

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[julien-c]

will merge like this because i think it's nice, but still open for some feedback/objections!

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