First-run demo walkthrough

[iLevyTate]

Summary

• Created 7 narrative transcripts for existing E2E walkthrough videos to facilitate future VoiceOver.
• Updated docs/E2E_WALKTHROUGH.md to reflect the correct model storage path and include a new section for video transcripts.
• Added docs/e2e-transcripts/README.md with guidelines for transcript format and recording.

Scope

• Area(s): Documentation, E2E Walkthrough
• 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:

• This PR primarily adds documentation (transcripts) and updates existing documentation. No functional changes require manual QA.

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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