refactor(cleanup): remove legacy agent classes and complete EvoAgent migration

Remove deprecated AnalystAgent, PMAgent, and RiskAgent classes.
All agent creation now goes through UnifiedAgentFactory creating EvoAgent instances.

- Delete backend/agents/analyst.py (169 lines)
- Delete backend/agents/portfolio_manager.py (420 lines)
- Delete backend/agents/risk_manager.py (139 lines)
- Update all imports to use EvoAgent exclusively
- Clean up unused imports across 25 files
- Update tests to work with simplified agent structure

Constraint: EvoAgent is now the single source of truth for all agent roles
Constraint: UnifiedAgentFactory handles runtime agent creation
Rejected: Keep legacy aliases | creates maintenance burden
Confidence: high
Scope-risk: moderate (affects agent instantiation paths)
Directive: All new agent features must be added to EvoAgent, not legacy classes
Not-tested: Kubernetes sandbox executor (marked with TODO)

backend/services/gateway.py

@@ -13,9 +13,7 @@ from typing import Any, Callable, Dict, List, Optional, Set
 import websockets
 from websockets.asyncio.server import ServerConnection
 
-from backend.data.provider_utils import normalize_symbol
 from backend.domains import news as news_domain
-from backend.llm.models import get_agent_model_info
 from backend.core.pipeline import TradingPipeline
 from backend.core.state_sync import StateSync
 from backend.services.market import MarketService
@@ -146,7 +144,7 @@ class Gateway:
         self.state_sync.update_state("status", "websocket_ready")
 
         # Create server but don't block yet - we'll serve inside the context manager
-        server = await websockets.serve(
+        await websockets.serve(
             self.handle_client,
             host,
             port,

backend/services/gateway_admin_handlers.py

@@ -22,7 +22,6 @@ from backend.config.bootstrap_config import (
     resolve_runtime_config,
     update_bootstrap_values_for_run,
 )
-from backend.data.market_ingest import ingest_symbols
 from backend.llm.models import get_agent_model_info
 
 

backend/services/gateway_openclaw_handlers.py

@@ -24,7 +24,7 @@ import logging
 from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:
-    from backend.services.gateway import Gateway
+    pass
 
 logger = logging.getLogger(__name__)
 
@@ -88,7 +88,6 @@ def _ensure_session_bridge(gateway) -> None:
 
 def _get_ws_client(gateway) -> "OpenClawWebSocketClient":
     """Get the OpenClaw WebSocket client from gateway."""
-    from shared.client.openclaw_websocket_client import OpenClawWebSocketClient
     client = gateway._openclaw_ws
     if client is None:
         raise RuntimeError("OpenClaw Gateway not connected")

backend/services/gateway_stock_handlers.py

@@ -15,7 +15,6 @@ from backend.domains import trading as trading_domain
 from backend.enrich.news_enricher import enrich_news_for_symbol
 from backend.enrich.llm_enricher import llm_enrichment_enabled
 from backend.tools.data_tools import prices_to_df
-from shared.client import NewsServiceClient, TradingServiceClient
 
 logger = logging.getLogger(__name__)
 
@@ -564,7 +563,6 @@ async def handle_get_stock_technical_indicators(gateway: Any, websocket: Any, da
         df = prices_to_df(prices)
         signal = gateway._technical_analyzer.analyze(ticker, df)
 
-        import pandas as pd
         df_sorted = df.sort_values("time").reset_index(drop=True)
         df_sorted["returns"] = df_sorted["close"].pct_change()
         vol_10 = float(df_sorted["returns"].tail(10).std() * (252**0.5) * 100) if len(df_sorted) >= 10 else None

backend/services/openclaw_cli.py

@@ -16,12 +16,9 @@ from typing import Any
 from shared.models.openclaw import (
     AgentSummary,
     AgentsList,
-    ApprovalRequest,
     ApprovalsList,
-    CronJob,
     CronList,
     DaemonStatus,
-    HookStatusEntry,
     HookStatusReport,
     ModelAliasesList,
     ModelFallbacksList,
@@ -29,20 +26,15 @@ from shared.models.openclaw import (
     ModelsList,
     OpenClawStatus,
     PairingListResponse,
-    PluginDiagnostic,
-    PluginRecord,
     PluginsList,
     QrCodeResponse,
     SecretsAuditReport,
     SecurityAuditResponse,
-    SecurityAuditReport,
     SessionEntry,
     SessionHistory,
     SessionsList,
-    SkillStatusEntry,
     SkillStatusReport,
     SkillUpdateResult,
-    UpdateCheckResult,
     UpdateStatusResponse,
     normalize_agents,
     normalize_approvals,
@@ -282,7 +274,6 @@ class OpenClawCliService:
 
         Reads the workspace directory and returns metadata + content for each .md file.
         """
-        import json
         from pathlib import Path
 
         wp = Path(workspace_path).expanduser().resolve()
@@ -500,7 +491,7 @@ class OpenClawCliService:
             "working", "in_progress", "processing", "thinking", "executing", "streaming",
         }
 
-        RECENCY_WINDOW_MS = 45 * 60 * 1000  # 45 minutes
+        45 * 60 * 1000  # 45 minutes
 
         result: dict[str, Any] = {"status": "connected", "agents": {}}
 
@@ -518,7 +509,6 @@ class OpenClawCliService:
                     continue
 
                 sessions = sessions_data if isinstance(sessions_data, list) else []
-                now_ms = 0  # placeholder; we'll skip recency check if no ts field
 
                 active_count = 0
                 for session in sessions:

backend/services/research_db.py

@@ -7,7 +7,7 @@ import json
 import sqlite3
 from datetime import datetime
 from pathlib import Path
-from typing import Any, Dict, Iterable
+from typing import Any, Iterable
 
 from shared.schema import CompanyNews