feat(infra): add sweep coordinator, structured logging, test suite, and README

Sweep coordinator (Step 16):
- SweepCoordinator runs all 8 agents in parallel with 60s per-agent / 300s total timeout
- Aggregates findings, actions, errors into SweepCoordinatorResult
- Registered in FastAPI lifespan; triggered via POST /sweep

Structured logging (Step 18):
- logging_utils/structured.py: JSONFormatter emitting ts/level/logger/msg + custom fields
- log_directive_event() for structured directive lifecycle logging
- push_to_loki() async Loki push (graceful no-op if LOKI_URL unset)
- configure_logging() replaces root handler at startup

Tests (Steps 17+19):
- conftest.py: mock_odoo, mock_pool, mock_llm fixtures
- test_tool_validator.py: 9 tests covering validation, coercion, hallucination stripping
- test_llm_router.py: 6 tests covering local/cloud/hybrid modes and HIPAA enforcement
- test_peer_bus.py: 6 tests covering registration, timeout, depth, circular detection
- test_finance_agent.py: 10 tests covering all 6 steps + sweep + peer request
- test_memory_manager.py: 3 tests covering context build + hard cap enforcement
- test_dispatch_router.py: 3 tests covering dispatch, rate limit, health endpoint
- test_odoo_client.py: 4 tests covering search_read, write result, unlink warning
- test_e2e_dispatch.py: 2 E2E tests - full dispatch cycle + peer bus communication

README (Step 20): architecture diagram, privacy modes, quick start, env vars, structure

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_memory_manager.py

@@ -0,0 +1,69 @@
+import pytest
+from unittest.mock import AsyncMock, MagicMock, patch
+
+
+@pytest.fixture
+def mock_conv_store():
+    store = MagicMock()
+    store.get = AsyncMock(return_value=[
+        {'role': 'user', 'content': 'What are my overdue invoices?'},
+        {'role': 'assistant', 'content': 'You have 3 overdue invoices.'},
+    ])
+    store.append = AsyncMock()
+    store.count = AsyncMock(return_value=2)
+    store.prune_old = AsyncMock()
+    return store
+
+
+@pytest.fixture
+def mock_op_store():
+    store = MagicMock()
+    store.get_recent = AsyncMock(return_value=[])
+    store.store = AsyncMock()
+    store.prune_expired = AsyncMock()
+    return store
+
+
+@pytest.fixture
+def mock_know_store():
+    store = MagicMock()
+    store.get_client_profile = AsyncMock(return_value={})
+    store.upsert = AsyncMock()
+    store.get = AsyncMock(return_value=None)
+    return store
+
+
+@pytest.mark.asyncio
+async def test_build_context_returns_master_context(mock_pool, mock_conv_store,
+                                                      mock_op_store, mock_know_store):
+    with patch('agent_service.memory.memory_manager.ConversationStore', return_value=mock_conv_store), \
+         patch('agent_service.memory.memory_manager.OperationalStore', return_value=mock_op_store), \
+         patch('agent_service.memory.memory_manager.KnowledgeStore', return_value=mock_know_store):
+        from agent_service.memory.memory_manager import MemoryManager
+        mgr = MemoryManager(pool=mock_pool, llm=None)
+        ctx = await mgr.build_context(user_id='1', intent_hint='finance')
+        assert ctx is not None
+        assert hasattr(ctx, 'conversation')
+
+
+@pytest.mark.asyncio
+async def test_append_message(mock_pool, mock_conv_store, mock_op_store, mock_know_store):
+    with patch('agent_service.memory.memory_manager.ConversationStore', return_value=mock_conv_store), \
+         patch('agent_service.memory.memory_manager.OperationalStore', return_value=mock_op_store), \
+         patch('agent_service.memory.memory_manager.KnowledgeStore', return_value=mock_know_store):
+        from agent_service.memory.memory_manager import MemoryManager
+        mgr = MemoryManager(pool=mock_pool, llm=None)
+        await mgr.append_message(user_id='1', role='user', content='Hello')
+        mock_conv_store.append.assert_awaited_once()
+
+
+@pytest.mark.asyncio
+async def test_hard_cap_enforced(mock_pool, mock_conv_store, mock_op_store, mock_know_store):
+    mock_conv_store.count = AsyncMock(return_value=201)
+    with patch('agent_service.memory.memory_manager.ConversationStore', return_value=mock_conv_store), \
+         patch('agent_service.memory.memory_manager.OperationalStore', return_value=mock_op_store), \
+         patch('agent_service.memory.memory_manager.KnowledgeStore', return_value=mock_know_store):
+        from agent_service.memory.memory_manager import MemoryManager
+        mgr = MemoryManager(pool=mock_pool, llm=None)
+        await mgr.append_message(user_id='1', role='user', content='test')
+        mock_conv_store.prune_old.assert_awaited()