Integrate NJS-GROWTH-07 proof assets into README

[SebaSOFT]

Summary

• embeds the accepted explainability trace SVG in the README as the current README-safe proof visual
• links README and VitePress proof-asset docs to benchmark methodology, visual-proof guardrails, explainability metadata, and playground capture specification
• adds/threads accepted NJS-GROWTH-07 proof asset docs, prompts, manifest, generated SVG/HTML assets, and the playground capture contract test

Guardrails

• no benchmark result claims are introduced
• benchmark visuals remain blocked until actual benchmark output sets result_kind: "actual_benchmark", is_placeholder: false, and claims_allowed: true
• playground GIF capture remains explicitly blocked until the playground route and capture automation exist

Validation

• git diff --check
• yarn lint
• yarn test — 12 files / 63 tests passed
• yarn examples
• yarn docs:build

Dependency note

This PR is stacked on PR #13 (growth/njs-growth-07-build-proof-assets-benchmarks-playground) because it integrates the accepted proof-asset bundle produced downstream of the benchmark contract work.

[gemini-code-assist]

Code Review

This pull request introduces a comprehensive visual proof system and benchmark asset plan for Neuron-JS, including storyboards, prompts, manifests, and specifications for benchmark charts, safety carousels, and playground captures. It also adds contract tests to validate these specifications and integrates the explainability trace diagram directly into the documentation and README. Feedback on the changes points out an unused ".card" CSS class within the newly added explainability-trace-diagram.svg stylesheet that should be removed for cleanliness.

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