feat: add solve_task.py direct solver and fix MCP rate limit issues

- Add solve_task.py: fast direct solver (1 LLM call per task, no deepagents overhead)
- Add RetryOnRateLimitMiddleware: auto-retry on 429 from any tool
- Fix double MCP load: __init__.py cleared, pipeline reuses agent.py journal tools
- Fix proxy: add NO_PROXY for openrouter.ai, platform.brojs.ru, git.brojs.ru
- Add utility scripts: get_task_ids.py, read_tasks.py
- Update run_pipeline.py: TARGET_IDS support, unbuffered output

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

run_pipeline.py

@@ -1,28 +1,64 @@
 """Запуск пайплайна для выполнения заданий курса."""
 import asyncio
-import sys
 import os
+import traceback
 
 os.environ["PYTHONIOENCODING"] = "utf-8"
+# Обходим локальный прокси для OpenRouter (иначе SSL-ошибка)
+os.environ["NO_PROXY"] = "openrouter.ai,platform.brojs.ru,git.brojs.ru," + os.environ.get("NO_PROXY", "")
 
 from dotenv import load_dotenv
 load_dotenv()
 
-from langchain_core.messages import HumanMessage
-from src.agent.graph.pipeline import pipeline
+from src.agent.graph.pipeline import pipeline, TaskInfo, process_one_task, route, PipelineState
+
+# Целевые задания (None = все todo-задания автоматически)
+TARGET_IDS = [
+    "6a1864f78a94f887e50d46da",  # Экзамен: RAG-агент с ChromaDB и веб-поиском
+]
 
 
 async def main():
     print("=== Запуск пайплайна BroJS ===")
-    result = await pipeline.ainvoke(
-        {
-            "tasks": [],
+
+    if TARGET_IDS:
+        tasks = [TaskInfo(id=tid, title="", status="todo") for tid in TARGET_IDS]
+        print(f"Целевые задания: {TARGET_IDS}")
+        initial_state = {
+            "tasks": tasks,
             "current_index": 0,
             "results": [],
             "errors": [],
-        },
-        {"configurable": {"thread_id": "pipeline-main"}},
-    )
+        }
+        from langgraph.graph import StateGraph, START
+        builder = StateGraph(PipelineState)
+        builder.add_node("process_one_task", process_one_task)
+        builder.add_edge(START, "process_one_task")
+        builder.add_conditional_edges(
+            "process_one_task", route,
+            {"process_one_task": "process_one_task", "__end__": "__end__"}
+        )
+        targeted_pipeline = builder.compile()
+        try:
+            result = await targeted_pipeline.ainvoke(
+                initial_state,
+                {"configurable": {"thread_id": "pipeline-targeted"}},
+            )
+        except Exception as e:
+            print(f"КРИТИЧЕСКАЯ ОШИБКА: {e}")
+            traceback.print_exc()
+            return
+    else:
+        try:
+            result = await pipeline.ainvoke(
+                {"tasks": [], "current_index": 0, "results": [], "errors": []},
+                {"configurable": {"thread_id": "pipeline-main"}},
+            )
+        except Exception as e:
+            print(f"КРИТИЧЕСКАЯ ОШИБКА: {e}")
+            traceback.print_exc()
+            return
+
     print("\n=== Результат пайплайна ===")
     for r in result.get("results", []):
         print(f"  Task {r['task_id'][:8]}: {r['status']} (mode={r['mode']}, retries={r['retries']})")