copy(landing): describe the knowledge commons in plain language

[JulioMCruz]

Why

The landing led with payment plumbing. "x402 access layer", "programmable payment rails", "paid knowledge layer", "sanitized premium research", and a strip listing Base, Celo, Solana and x402. The API preview showed Authorization: x402 or internal token and a sample query of ERC-8004 x402 agent payments.

A visitor learned how payment works before learning what the service is for. It also reads as a market first and a knowledge base second, which is backwards: the value is that a team writes something down once and every helper can use it afterwards.

What changed

• Hero: "Write it down once. Every helper can use it." The lead explains the commons in one sentence, including that contributors are recognized when their knowledge answers something.
• Features: ask in plain words (answers come with sources), yours stays yours (private notes stay private), contributors are recognized, checked before it spreads (the independent validation that already exists).
• Strip: what the service actually runs on (open source, self-hostable, MCP, Qdrant, Postgres, Firebase, Docker) instead of chain names.
• API preview: an ordinary question and a Bearer key.
• Interfaces: same three endpoints, described by what they give you. The /paid/report/:slug route is unchanged, its description now says the people who wrote the report get something back.
• Closing: any agent that speaks MCP can read the commons, not just ours.
• layout.tsx metadata description follows.

Scope

Text only, in App/app/page.tsx and the metadata line in App/app/layout.tsx. No routes, components, styles, or logic.

Verification

• npx tsc --noEmit: no errors in the two touched files (the pre-existing tests/encoders-openai.test.ts errors are unrelated and present on main).
• npx vitest run: 19 files, 217 tests, all green.

Deploy note: served from the VPS, so it needs a manual deploy after merge.