feat: add git-consistent memory gateway architecture

gateway/tests/test_sync_logic.py

@@ -0,0 +1,55 @@
+from __future__ import annotations
+
+from concurrent.futures import ThreadPoolExecutor
+
+
+def test_sync_endpoint_and_status(client):
+    sync_resp = client.post("/sync", json={"branch": "main", "require_latest": True})
+    assert sync_resp.status_code == 200
+    sync_payload = sync_resp.json()
+    assert sync_payload["ok"] is True
+    assert sync_payload["branch"] == "main"
+    assert sync_payload["commit_hash"]
+    assert sync_payload["synced_at"]
+
+    status_resp = client.get("/status")
+    assert status_resp.status_code == 200
+    status_payload = status_resp.json()
+    assert status_payload["ok"] is True
+    assert any(item["branch"] == "main" for item in status_payload["workspaces"])
+
+
+def test_concurrent_branch_queries(client):
+    def run(body: dict):
+        return client.post("/query", json=body)
+
+    with ThreadPoolExecutor(max_workers=2) as pool:
+        fut_main = pool.submit(
+            run,
+            {"branch": "main", "query_type": "search", "query": "main-exclusive-signal", "require_latest": True},
+        )
+        fut_month = pool.submit(
+            run,
+            {
+                "branch": "memory/2026-03",
+                "query_type": "search",
+                "query": "monthly-exclusive-signal",
+                "require_latest": True,
+            },
+        )
+
+        resp_main = fut_main.result()
+        resp_month = fut_month.result()
+
+    assert resp_main.status_code == 200
+    assert resp_month.status_code == 200
+
+    payload_main = resp_main.json()
+    payload_month = resp_month.json()
+
+    assert payload_main["branch"] == "main"
+    assert payload_month["branch"] == "memory/2026-03"
+    assert payload_main["resolved_workspace"] != payload_month["resolved_workspace"]
+
+    assert payload_main["results"]
+    assert payload_month["results"]