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/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: