Surface Contract: platform API behavior and x402 pre-payment checks

• list_surface_contracts — List the platform surface contracts published in Penny's free registry, with claim counts.
• get_surface_contract — Get the machine-readable surface contract for a platform host (read/write semantics, pending states, rate limits, limits, idempotency, pagination completeness,
• verify_surface — Run the anonymous conformance checks for a contract now and return verified / failed / unknown / manual / unsupported per claim.
• contribute_discrepancy — Report a platform behaviour that contradicts a published claim, or a new claim, with evidence. One-line call: POST /v1/contribute with {contractId, kind, statem
• get_integration_recipe — Get a plain-text integration recipe for a platform: the order of operations to use it, and a guard clause for every behaviour we measured going wrong, each nami
• preflight_mcp_server — Run the anonymous MCP handshake against ANY https MCP endpoint you name, right now, and get back a verdict (open / refused / unreachable / initialize-transport-
• prepay_check — Check an x402 route BEFORE you pay it. GET /v1/prepay?url=<the route> makes ONE unpaid GET with no payment header and no credential, and returns one row: the me

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