v2.6.1

Changed

• Tracks Member API 2.6.1. The API now requires a User-Agent header on every
  request (400 user_agent_required without one) and refuses the official
  clients below 2.0.0 (426 client_upgrade_required, with the upgrade command
  in hint). Both clients already send dc-py/<version> / dc-ts/<version>,
  so nothing changes for 2.x users — this release keeps the version in lockstep
  so 2.6.x clients are not warned as a minor behind.
• Pinned contract (contracts/openapi.json) picks up the new authentication
  wording.