feat(agentscope): add memory system and automation job support

- Add consumer_registry and pipeline_registry for runtime orchestration
- Add Visibility schema for message filtering
- Add PipelineSpec for agent pipeline configuration
- Add automation job models and configuration
- Remove memory_prompt.py (consolidated into memory system)
- Update runtime components: context_loader, context_service, orchestrator, runner, tasks
- Update toolkit: tool_config, tool_middleware, custom tools (calendar, user_lookup)
- Add auth_helpers and calendar_domain utilities
- Add system_agents.yaml configuration

backend/tests/unit/schemas/agent/test_visibility.py

@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+import pytest
+
+from schemas.agent.visibility import VisibilityMask, bit_mask
+
+
+def test_visibility_mask_from_bits_and_contains() -> None:
+    mask = VisibilityMask.from_bits(bits=[0, 16, 18])
+
+    assert mask.contains(bit=0) is True
+    assert mask.contains(bit=16) is True
+    assert mask.contains(bit=17) is False
+
+
+def test_visibility_mask_rejects_out_of_range_bit() -> None:
+    with pytest.raises(ValueError, match="range"):
+        VisibilityMask.from_bits(bits=[64])
+
+
+def test_bit_mask_builds_single_bit_integer() -> None:
+    assert bit_mask(bit=0) == 1
+    assert bit_mask(bit=16) == (1 << 16)