Brings in the qbit-email transport (#11). Conflicts are resolved in favour of the RC.6/provider-api side, keeping qbit-email. qbit-email is a new cross-qbit implementation dependency that the enforced G1 guardrail rejects. It is allow-listed explicitly and temporarily until qbit-email publishes an API (#13). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>