feat(agent): complete EvoAgent integration for all 6 agent roles

Migrate all agent roles from Legacy to EvoAgent architecture:
- fundamentals_analyst, technical_analyst, sentiment_analyst, valuation_analyst
- risk_manager, portfolio_manager

Key changes:
- EvoAgent now supports Portfolio Manager compatibility methods (_make_decision,
  get_decisions, get_portfolio_state, load_portfolio_state, update_portfolio)
- Add UnifiedAgentFactory for centralized agent creation
- ToolGuard with batch approval API and WebSocket broadcast
- Legacy agents marked deprecated (AnalystAgent, RiskAgent, PMAgent)
- Remove backend/agents/compat.py migration shim
- Add run_id alongside workspace_id for semantic clarity
- Complete integration test coverage (13 tests)
- All smoke tests passing for 6 agent roles

Constraint: Must maintain backward compatibility with existing run configs
Constraint: Memory support must work with EvoAgent (no fallback to Legacy)
Rejected: Separate PM implementation for EvoAgent | unified approach cleaner
Confidence: high
Scope-risk: broad
Directive: EVO_AGENT_IDS env var still respected but defaults to all roles
Not-tested: Kubernetes sandbox mode for skill execution

backend/agents/risk_manager.py

@@ -2,7 +2,13 @@
 """
 Risk Manager Agent - Based on AgentScope ReActAgent
 Uses LLM for risk assessment
+
+.. deprecated:: 0.2.0
+    RiskAgent is deprecated and will be removed in a future version.
+    Use :class:`backend.agents.base.evo_agent.EvoAgent` instead.
+    See docs/CRITICAL_FIXES.md for migration guide.
 """
+import warnings
 from typing import Any, Dict, Optional
 
 from agentscope.agent import ReActAgent
@@ -13,11 +19,23 @@ from agentscope.tool import Toolkit
 from ..utils.progress import progress
 from .prompt_factory import build_agent_system_prompt, clear_prompt_factory_cache
 
+# Emit deprecation warning on module import
+warnings.warn(
+    "RiskAgent is deprecated. Use EvoAgent instead. "
+    "See docs/CRITICAL_FIXES.md for migration guide.",
+    DeprecationWarning,
+    stacklevel=2,
+)
+
 
 class RiskAgent(ReActAgent):
     """
     Risk Manager Agent - Uses LLM for risk assessment
     Inherits from AgentScope's ReActAgent
+
+    .. deprecated:: 0.2.0
+        Use :class:`backend.agents.base.evo_agent.EvoAgent` with
+        workspace-driven configuration instead.
     """
 
     def __init__(
@@ -32,6 +50,10 @@ class RiskAgent(ReActAgent):
         """
         Initialize Risk Manager Agent
 
+        .. deprecated:: 0.2.0
+            Use :class:`backend.agents.unified_factory.UnifiedAgentFactory`
+            or :class:`backend.agents.base.evo_agent.EvoAgent` instead.
+
         Args:
             model: LLM model instance
             formatter: Message formatter instance
@@ -39,6 +61,13 @@ class RiskAgent(ReActAgent):
             config: Configuration dictionary
             long_term_memory: Optional ReMeTaskLongTermMemory instance
         """
+        # Emit runtime deprecation warning
+        warnings.warn(
+            "RiskAgent is deprecated. Use EvoAgent via UnifiedAgentFactory instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+
         object.__setattr__(self, "config", config or {})
         object.__setattr__(self, "agent_id", name)