chore: import upstream snapshot with attribution

tests/test_tools/test_memory_save_limits.py

@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+from opensquilla.tools.builtin.memory_tools import create_memory_tools
+from opensquilla.tools.registry import ToolRegistry
+
+
+class _Store:
+    async def index_file(self, *, path, content, source) -> int:
+        return 1
+
+    async def remove_file(self, path: str) -> None:
+        return None
+
+    async def total_size(self) -> int:
+        return 0
+
+
+class _Retriever:
+    async def search(self, query, opts, *, intent):
+        return []
+
+
+def _make_memory_save(workspace: str, max_files: int):
+    registry = ToolRegistry()
+    memory_config = SimpleNamespace(
+        max_file_size_kb=0,
+        max_total_size_kb=0,
+        max_files=max_files,
+        entry_ttl_days=0,
+    )
+    create_memory_tools(
+        stores=_Store(),
+        retrievers=_Retriever(),
+        memory_dir=workspace,
+        registry=registry,
+        memory_config=memory_config,
+        memory_source="workspace",
+    )
+    runtime_tool = registry.get("memory_save")
+    assert runtime_tool is not None
+    return runtime_tool.handler
+
+
+async def test_max_files_cap_ignores_non_memory_markdown(tmp_path):
+    workspace = tmp_path / "ws"
+    docs = workspace / "docs"
+    docs.mkdir(parents=True)
+    for i in range(3):
+        (docs / f"guide-{i}.md").write_text(f"# project doc {i}\n", encoding="utf-8")
+
+    memory_save = _make_memory_save(str(workspace), max_files=3)
+
+    result = await memory_save(content="durable fact", path="memory/2026-07-09.md")
+    assert "Saved to memory/2026-07-09.md" in result
+    assert (workspace / "memory" / "2026-07-09.md").exists()