Walkthrough e2e docs

[iLevyTate]

Summary

• Made docs/E2E_WALKTHROUGH.md discoverable by linking it in docs/README.md and the top-level README.md.
• Updated Node.js version references in README.md to align with .nvmrc (v20.11.0).
• Ensured overall README consistency across the repo.

Scope

• Area(s): Documentation
• Risk Level: Low
• Breaking Changes: None

Type of Change

• Bug fix
• Enhancement
• New feature
• Refactor
• Documentation update
• Breaking change

Test Plan

Automated

• npm run format:check
• npm run lint
• npm test
• Additional tests added/updated when behavior changed

Manual QA

• Manual checklist completed (see TESTING.md)
• Not applicable (explain below)

Manual QA notes:

• Verified docs/E2E_WALKTHROUGH.md is linked in docs/README.md and README.md.
• Confirmed Node.js version in README.md matches .nvmrc.
• Reviewed all updated READMEs for correct formatting and content.

Checklist

• I scoped this PR to one logical change
• I self-reviewed code and naming for clarity
• I updated docs/config references where needed
• I called out follow-up work or known limitations

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