VALIDATION PASS

All governed quantitative checks reproduced from the public package build.

Run totals (visible source records / unique cited domains / citation-bearing prompts)
- ChatGPT: 92 / 64 / 24
- Claude: 56 / 21 / 18
- Perplexity: 225 / 156 / 24
- Gemini: 21 / 6 / 6

Gemini raw formatting check
- 21 semantic source records correspond to 42 literal URL occurrences because each Markdown link repeats the URL as both visible text and target.

Cross-engine cited-domain union
- 211 total
- 180 on one engine
- 27 on two
- 3 on three
- 1 on all four

Provider-selection first-party checks
- ChatGPT 7/72
- Claude 6/53
- Gemini 8/30
- Perplexity 43/107

Buyer-source ownership
- 67 owner-normalized sources
- 42 agency/service provider
- 12 software/platform
- 5 news/editorial
- 3 community/social
- 2 directory/marketplace
- 2 practitioner/consultancy
- 1 search trade publication
