Production API Versioning

Added signed 31-, 90-, and 365-day prepayment, atomic same-key renewal, and subscriber-wallet paid-key rotation.

Added bounded identifier-free product events and operator-authorized aggregate telemetry while removing exact public commercial counters.

Hardened settlement-domain binding, success-only credit metering, claim replay/concurrency, revocation tombstones, checkout resume safety, and responsive purchase flows.

Added a live no-wallet sample route, identifier-free aggregate funnel counters, and source-linked structural validation.

Added x402 Bazaar discovery metadata to every payable route and post-settlement revenue measurement.

Replaced unsafe risk/safety labels and SDK thresholds with capability observations, evidence quality, explicit limitations, and caller-defined policy.