Fix Jenkins-update flow: redeploy_project pull + delete_image safety + delete_container

Bug fixes from product test:
1. redeploy_project: BUILD_FAILED now includes explicit image pull (stop → pull → start)
2. delete_image: Distinguishes running vs stopped containers, suggests system_prune for stopped refs
3. New tool delete_container: Verify stopped state before deletion, confirmation required

Tests added for all three paths plus stopped-container edge cases.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

tests/test_modules/test_containers.py

@@ -247,6 +247,76 @@ async def test_container_stats_found():
     assert "Block I/O" in result
 
 
+# ──────────────────────────────────────────────────────────────────────────────
+#  delete_container
+# ──────────────────────────────────────────────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_delete_container_preview():
+    from mcp_synology_container.modules.containers import register_containers
+
+    client = AsyncMock()
+
+    mcp, tools = make_mock_mcp()
+    register_containers(mcp, make_config(), client)
+
+    result = await tools["delete_container"]("myapp_web", confirmed=False)
+    assert "Preview" in result
+    assert "myapp_web" in result
+    client.request.assert_not_called()
+
+
+@pytest.mark.asyncio
+async def test_delete_container_not_found():
+    from mcp_synology_container.modules.containers import register_containers
+
+    client = AsyncMock()
+    client.request.return_value = None
+
+    mcp, tools = make_mock_mcp()
+    register_containers(mcp, make_config(), client)
+
+    result = await tools["delete_container"]("nonexistent", confirmed=True)
+    assert "not found" in result
+
+
+@pytest.mark.asyncio
+async def test_delete_container_running_blocked():
+    from mcp_synology_container.modules.containers import register_containers
+
+    client = AsyncMock()
+    client.request.return_value = {
+        "details": {"State": {"Running": True, "Status": "running"}},
+        "profile": {"image": "nginx:latest"},
+    }
+
+    mcp, tools = make_mock_mcp()
+    register_containers(mcp, make_config(), client)
+
+    result = await tools["delete_container"]("myapp_web", confirmed=True)
+    assert "running" in result.lower()
+    assert "Cannot delete" in result
+
+
+@pytest.mark.asyncio
+async def test_delete_container_stopped_confirmed():
+    from mcp_synology_container.modules.containers import register_containers
+
+    client = AsyncMock()
+    client.request.return_value = {
+        "details": {"State": {"Running": False, "Status": "exited"}},
+        "profile": {"image": "nginx:latest"},
+    }
+
+    mcp, tools = make_mock_mcp()
+    register_containers(mcp, make_config(), client)
+
+    result = await tools["delete_container"]("myapp_web", confirmed=True)
+    assert "Deleted" in result
+    assert "myapp_web" in result
+
+
 @pytest.mark.asyncio
 async def test_container_stats_cpu_calculation():
     """CPU% is computed via the standard Docker formula."""
@@ -537,7 +607,10 @@ async def test_get_container_logs_resolves_hash_prefix():
             return HASH_PREFIXED_CONTAINERS_DATA
         if api == "SYNO.Docker.Container.Log" and method == "get":
             assert kwargs["params"]["name"] == "f93cb8b504f7_jenkins"
-            return {"logs": [{"created": "2025-01-01", "stream": "stdout", "text": "started"}], "total": 1}
+            return {
+                "logs": [{"created": "2025-01-01", "stream": "stdout", "text": "started"}],
+                "total": 1,
+            }
         return {}
 
     client = AsyncMock()