fix(test): make test-quick reliable as developer gate

Fixes for D-001验收问题:
1. test-quick.sh: use set -euo pipefail, uv run ruff, no tail pipe
2. Remove unused imports in factories (app.py, platform.py, provider.py)
3. Fix unused variable in smoke test
4. Add noqa: E402 to test_n8nsvapi.py lazy imports
5. Update smoke test docs: "minimal fake flow" not full pipeline

Now test-quick is a reliable gate: lint failures exit 1, test failures propagate.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/factories/app.py

@@ -8,8 +8,6 @@ from __future__ import annotations
 
 from unittest.mock import AsyncMock, Mock
 
-import langbot_plugin.api.entities.builtin.provider.session as provider_session
-
 
 class FakeApp:
     """Mock Application object providing all basic dependencies needed by stages."""

tests/factories/platform.py

@@ -13,7 +13,6 @@ import typing
 import langbot_plugin.api.entities.builtin.platform.message as platform_message
 import langbot_plugin.api.entities.builtin.platform.events as platform_events
 import langbot_plugin.api.entities.builtin.platform.entities as platform_entities
-import langbot_plugin.api.entities.builtin.provider.session as provider_session
 
 
 class FakePlatform:

tests/factories/provider.py

@@ -6,7 +6,7 @@ Provides a deterministic fake provider that simulates LLM responses without real
 
 from __future__ import annotations
 
-from unittest.mock import AsyncMock, Mock
+from unittest.mock import Mock
 import typing
 
 import langbot_plugin.api.entities.builtin.provider.message as provider_message

tests/smoke/test_fake_message_flow.py

@@ -1,8 +1,10 @@
 """
-Smoke tests for LangBot core message flow.
+Minimal fake flow smoke tests for LangBot.
 
-These tests verify the basic message processing flow works correctly
-using fake providers and platforms.
+These tests verify basic component interactions using fake providers and platforms.
+Not a full pipeline integration test - tests individual factory components.
+
+For full pipeline tests, see tests/integration/ (planned).
 """
 
 from __future__ import annotations
@@ -272,21 +274,25 @@ class TestFakeMessageFlow:
 
 
 class TestMessageFlowIntegration:
-    """Integration smoke tests for full message flow."""
+    """Minimal fake flow integration tests.
+
+    These tests verify component interactions but do NOT run full LangBot pipeline.
+    For real pipeline tests, integration tests are needed (planned).
+    """
 
     @pytest.mark.asyncio
     async def test_minimal_message_flow(self):
-        """Smoke test: message enters, fake provider responds, platform captures outbound.
+        """Minimal fake flow test: fake query -> fake provider -> fake platform.
 
         This test verifies:
-        1. Fake app is created
-        2. Fake text message enters
-        3. Fake provider returns LANGBOT_FAKE_PONG
-        4. Fake platform captures outbound response
-        5. No unexpected exception
+        1. Fake text query is created
+        2. Fake provider returns LANGBOT_FAKE_PONG
+        3. Fake platform captures outbound response
+        4. No unexpected exception
+
+        Note: This does NOT run actual LangBot pipeline stages.
         """
         # Setup
-        app = FakeApp()
         platform = FakePlatform(bot_account_id="test-bot")
         provider = fake_provider_pong()
         model = fake_model(provider=provider)

tests/unit_tests/pipeline/test_n8nsvapi.py

@@ -23,9 +23,9 @@ sys.modules.setdefault('langbot.pkg.provider.runner', _mock_runner)
 sys.modules.setdefault('langbot.pkg.core.app', MagicMock())
 sys.modules.setdefault('langbot.pkg.utils.httpclient', MagicMock())
 
-import pytest
-import langbot_plugin.api.entities.builtin.provider.message as provider_message
-from langbot.pkg.provider.runners.n8nsvapi import N8nServiceAPIRunner
+import pytest  # noqa: E402
+import langbot_plugin.api.entities.builtin.provider.message as provider_message  # noqa: E402
+from langbot.pkg.provider.runners.n8nsvapi import N8nServiceAPIRunner  # noqa: E402
 
 
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