v0.7.0 — release ceremony: bump from v0.6.0 → v0.7.0 with smooth user-schema upgrade verified

Full content on GitLab: https://gitlab.com/trustmybot/plugin/-/issues/2929

(Tri-source sync schema landed in MR !208 but mirror logic not yet bidirectional; this issue is a stub for v0.7.x board review.)