docs: explain Lynchpin through questions and source boundaries

[Sinity]

Summary

• replace the jargon-heavy opening with a direct description of joined personal data
• add concrete questions the platform can answer
• explain materialization, DuckDB, graphs, analysis, and MCP in ordinary language
• keep the Polylogue, Sinex, and Sinnix data boundaries explicit
• remove em dashes and reduce generated-sounding phrasing

Verification

Documentation-only change. The branch changes only README.md and preserves the current source, MCP, and trust-boundary contracts.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 27970209-016d-4ccb-abb9-79d3382ca891

📥 Commits

Reviewing files that changed from the base of the PR and between b717490 and 978056d.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-reader-first-2026-07-26

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