M1: contracts and vectors (SPEC v0.1, schema 1)

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>

contracts/examples/E-28-create-recurring-template/response.json

@@ -0,0 +1,34 @@
+{
+  "id": "0192a004-0000-7000-8000-000000000001",
+  "account_id": "0192a003-0000-7000-8000-000000000001",
+  "category_id": "01920000-0000-7000-8000-000000000003",
+  "amount_ore": 1250000,
+  "description": "Hyra",
+  "notes": "",
+  "payer_user_id": "0192a000-0000-7000-8000-000000000001",
+  "split_mode": "ratio",
+  "splits": [
+    {
+      "user_id": "0192a000-0000-7000-8000-000000000001",
+      "share_bp": 6000,
+      "share_ore": null
+    },
+    {
+      "user_id": "0192a000-0000-7000-8000-000000000002",
+      "share_bp": 4000,
+      "share_ore": null
+    }
+  ],
+  "day_of_month": 25,
+  "start_period": "2026-10",
+  "end_period": null,
+  "paused": false,
+  "last_generated_period": null,
+  "next_occurrence_date": "2026-10-25",
+  "created_by_user_id": "0192a000-0000-7000-8000-000000000001",
+  "updated_by_user_id": "0192a000-0000-7000-8000-000000000001",
+  "created_at": "2026-10-17T06:30:02.004Z",
+  "updated_at": "2026-10-17T06:30:02.004Z",
+  "deleted_at": null,
+  "server_version": 30
+}