Keep parity candidates out of published package

[DennisSmolek]

Summary

• move source-parity shader graphs and orchestration into a frozen bench-owned upscaler while preserving all benchmark identities
• guard the built and packed library against candidate leakage, reducing dist/index.js from about 189 kB to 120 kB
• verify the linked TSL guides graph through the packed npm artifact on a real GPU and graduate that surface from @experimental

Closes #2.
Closes #3.

Test plan

• npm test (202 tests)
• npm run typecheck
• npm run lint
• npm run build
• npm run examples:build
• npm run verify:packed-guides
• npm run verify:packed-guides:gpu (16 ordered split frames, 2 backing textures, 0 monolithic fallbacks)
• GPU smoke all three source-bundle candidates against rcas-fsr315-limiter

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