Merge remote-tracking branch 'origin/refactor/eba' into dev_4_11

# Conflicts:
#	pyproject.toml
#	src/langbot/pkg/pipeline/preproc/preproc.py
#	uv.lock

tests/unit_tests/pipeline/test_preproc_media_fallback.py

@@ -0,0 +1,70 @@
+from __future__ import annotations
+
+from datetime import datetime
+from types import SimpleNamespace
+from unittest.mock import AsyncMock, Mock
+
+import pytest
+
+from langbot_plugin.api.entities.builtin.platform import message as platform_message
+
+
+def _conversation():
+    prompt = Mock()
+    prompt.messages = []
+    prompt.copy = Mock(return_value=Mock(messages=[]))
+
+    return SimpleNamespace(
+        uuid='conversation-uuid',
+        create_time=datetime.now(),
+        update_time=datetime.now(),
+        prompt=prompt,
+        messages=[],
+    )
+
+
+def _prompt_preprocessing_context():
+    ctx = Mock()
+    ctx.event.default_prompt = []
+    ctx.event.prompt = []
+    return ctx
+
+
+@pytest.mark.asyncio
+async def test_preprocessor_keeps_image_placeholder_for_text_only_local_agent(mock_app, sample_query):
+    model = Mock()
+    model.model_entity.uuid = 'text-only-model'
+    model.model_entity.abilities = []
+
+    mock_app.model_mgr.get_model_by_uuid = AsyncMock(return_value=model)
+    mock_app.sess_mgr.get_session = AsyncMock(
+        return_value=SimpleNamespace(launcher_type=sample_query.launcher_type, launcher_id=sample_query.launcher_id)
+    )
+    mock_app.sess_mgr.get_conversation = AsyncMock(return_value=_conversation())
+    mock_app.plugin_connector.emit_event = AsyncMock(return_value=_prompt_preprocessing_context())
+
+    sample_query.pipeline_config = {
+        'ai': {
+            'runner': {'runner': 'local-agent'},
+            'local-agent': {'model': {'primary': 'text-only-model', 'fallbacks': []}, 'prompt': []},
+        },
+        'trigger': {'misc': {'combine-quote-message': False}},
+        'output': {'misc': {'exception-handling': 'show-hint'}},
+    }
+    sample_query.message_chain = platform_message.MessageChain(
+        [platform_message.Image(base64='data:image/png;base64,AAAA')]
+    )
+    sample_query.messages = []
+    sample_query.variables = {}
+
+    from importlib import import_module
+
+    import_module('langbot.pkg.pipeline.pipelinemgr')
+    preproc_module = import_module('langbot.pkg.pipeline.preproc.preproc')
+    result = await preproc_module.PreProcessor(mock_app).process(sample_query, 'PreProcessor')
+    content = result.new_query.user_message.content
+
+    assert len(content) == 1
+    assert content[0].type == 'text'
+    assert content[0].text == '[Image]'
+    assert result.new_query.variables['user_message_text'] == '[Image]'