contracts/openapi.yaml (OpenAPI 3.1, E-1..E-33, error shape and the
exhaustive error code enum, device bearer scheme), contracts/schema/
server-v1.sql (SPEC §14.1 verbatim), seven test-vector files per §14.5.5,
80 examples (every JSON body of §14.3.4, every error code, sync pull/push,
every FCM push type), and tools/contracts-check.py (stdlib-only reference
of §9.1, §9.3, §9.4 and §14.5.4 plus shape checks; the M1 gate).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
