feat: let PO select developer worker

docs/coding-agents.md

@@ -88,6 +88,12 @@ documentation for the upstream behavior.
 
 Developer node в Engineering Subgraph использует coding agents через `worker-manager` сервис (PO не использует контейнеры — это LangGraph ReactAgent):
 
+При создании проекта PO передаёт выбранного developer-воркера в
+`create_project(agent_type="claude" | "factory" | "codex")`. Значение сохраняется
+в `project.config.agent_type` и действует для engineering-задач этого проекта.
+Если выбор не указан, используется `claude`. Неизвестное значение отклоняется до
+создания проекта.
+
 1. Worker-manager создаёт контейнер из worker-base образа
 2. Монтирует pre-scaffolded workspace (`/data/workspaces/{repo_id}/`) — код уже на месте
 3. Worker-manager creates/checks out story feature branch (`story/{story_id}`)

services/langgraph/src/agents/po/tools_projects.py

@@ -11,6 +11,7 @@
 import structlog
 
 from shared.contracts.dto.project import ProjectStatus, ServiceModule
+from shared.contracts.vocab import AgentType
 
 from .tools_shared import _get_api, _user_headers
 
@@ -23,6 +24,11 @@
 # Available modules (single source of truth: ServiceModule enum)
 # ---------------------------------------------------------------------------
 AVAILABLE_MODULES = {m.value for m in ServiceModule}
+AVAILABLE_DEVELOPER_AGENTS = {
+    AgentType.CLAUDE.value,
+    AgentType.FACTORY.value,
+    AgentType.CODEX.value,
+}
 
 HTTP_OK = 200
 TELEGRAM_API_TIMEOUT = 10
@@ -33,6 +39,7 @@ async def create_project(
     name: str,
     modules: str = "backend",
     description: str = "",
+    agent_type: str = AgentType.CLAUDE.value,
     *,
     config: RunnableConfig,
 ) -> str:
@@ -42,6 +49,7 @@ async def create_project(
         name: Project name (lowercase, starts with letter, only a-z/0-9/hyphens).
         modules: Comma-separated modules: backend, tg_bot, notifications, frontend.
         description: What the project should do.
+        agent_type: Developer worker: claude, factory, or codex.
     """
     modules_list = [m.strip() for m in modules.split(",") if m.strip()]
 
@@ -50,11 +58,20 @@ async def create_project(
         available = ", ".join(sorted(AVAILABLE_MODULES))
         return f"Error: invalid modules: {', '.join(invalid)}. Available: {available}"
 
+    if agent_type not in AVAILABLE_DEVELOPER_AGENTS:
+        available = ", ".join(sorted(AVAILABLE_DEVELOPER_AGENTS))
+        return f"Error: invalid agent_type: {agent_type}. Available: {available}"
+
     if "backend" not in modules_list:
         modules_list.insert(0, "backend")
 
     project_id = str(uuid.uuid4())
-    proj_config = {"modules": modules_list, "description": description, "name": name}
+    proj_config = {
+        "modules": modules_list,
+        "description": description,
+        "name": name,
+        "agent_type": agent_type,
+    }
 
     payload = {
         "id": project_id,

services/langgraph/tests/unit/po/test_tools.py

@@ -86,6 +86,29 @@ async def test_creates_project_with_modules(self, mock_api_client):
         assert "Project created" in result
         assert "abc123" in result
 
+    @pytest.mark.asyncio
+    @pytest.mark.parametrize("agent_type", ["claude", "factory", "codex"])
+    async def test_persists_selected_developer_agent(self, mock_api_client, agent_type):
+        mock_api_client.post.return_value = _make_response({"id": "x", "name": "project"})
+
+        await create_project.ainvoke(
+            {"name": "project", "modules": "backend", "agent_type": agent_type},
+            config=_make_config("user-1"),
+        )
+
+        project_call = mock_api_client.post.call_args_list[0]
+        assert project_call[1]["json"]["config"]["agent_type"] == agent_type
+
+    @pytest.mark.asyncio
+    async def test_rejects_unknown_developer_agent(self, mock_api_client):
+        result = await create_project.ainvoke(
+            {"name": "project", "modules": "backend", "agent_type": "mystery"},
+            config=_make_config("user-1"),
+        )
+
+        assert result == "Error: invalid agent_type: mystery. Available: claude, codex, factory"
+        mock_api_client.post.assert_not_called()
+
     @pytest.mark.asyncio
     async def test_passes_telegram_id_header(self, mock_api_client):
         mock_api_client.post.return_value = _make_response({"id": "x", "name": "y"})