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Milestone 5 (media): - POST /api/v1/media — multipart upload, attaches to feature/issue/project/ phase/layer, idempotent by uuid, authz member + 'upload media'. Added uuid+client_updated_at to media. - Bundle now includes a 'media' array (URLs) for the project's project/feature/ issue attachments (delta-aware). Milestone 6 (hardening + docs): - sync_logs table/model: every applied op is logged; /sync short-circuits on a repeated op uuid -> 'duplicate' (true idempotency for updates too, not just creates). - Rate limiting on login (10/min), sync (60/min), media (120/min). - docs/openapi.yaml: OpenAPI 3 contract for the mobile team. Tests: 18 passing (added media upload idempotency + sync_logs idempotency). The mobile API (Milestones 1-6) is now feature-complete on the webapp side. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>