docs(02-01): add execution summary

.planning/phases/02-safety-sandboxing/02-01-SUMMARY.md

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+# Phase 02-01 Execution Summary
+
+**Date:** 2026-01-27  
+**Phase:** 02 - Safety & Sandboxing  
+**Plan:** 01 - Security Assessment Infrastructure  
+**Status:** ✅ COMPLETED
+
+---
+
+## Objective Completed
+
+Created multi-level security assessment infrastructure to analyze code before execution using Bandit and Semgrep integration with configurable security policies.
+
+---
+
+## Tasks Executed
+
+### ✅ Task 1: Create security assessment module
+**Files:** `src/security/__init__.py`, `src/security/assessor.py`
+
+**Completed:**
+- Created `SecurityAssessor` class with `assess(code: str)` method
+- Integrated Bandit and Semgrep analysis via subprocess
+- Implemented SecurityLevel enum (LOW/MEDIUM/HIGH/BLOCKED)
+- Added custom pattern analysis for additional security checks
+- Included comprehensive error handling and graceful degradation
+
+**Key Features:**
+- Multi-tool security analysis (Bandit + Semgrep + custom patterns)
+- Configurable scoring thresholds via security.yaml
+- Detailed findings reporting with recommendations
+- Temp file management for secure code analysis
+
+### ✅ Task 2: Add security dependencies and configuration  
+**Files:** `requirements.txt`, `config/security.yaml`
+
+**Completed:**
+- Added `bandit>=1.7.7` and `semgrep>=1.99` to requirements.txt
+- Created comprehensive `config/security.yaml` with security policies
+- Defined BLOCKED triggers for malicious patterns and known threats
+- Defined HIGH triggers for admin/root access and system modifications
+- Configured severity thresholds and trusted code patterns
+- Added user override settings and assessment configurations
+
+**Security Policies:**
+- **BLOCKED:** Malicious patterns, system calls, eval/exec, file operations
+- **HIGH:** Admin access attempts, system file modifications, privilege escalation
+- **MEDIUM:** Suspicious imports, risky function calls
+- **LOW:** Safe code with minimal security concerns
+
+---
+
+## Verification Results
+
+### ✅ SecurityAssessor Functionality
+- ✅ Class imports successfully without errors
+- ✅ Analyzes code and returns correct SecurityLevel classifications
+- ✅ Handles empty input and malformed code gracefully
+- ✅ Provides detailed findings with security scores
+- ✅ Generates actionable security recommendations
+
+### ✅ Security Level Classification Testing
+- **Safe code:** LOW (0 points) - No security concerns
+- **Risky code:** BLOCKED (12 points) - System calls + subprocess usage
+- **Malicious code:** BLOCKED (21 points) - eval/exec + input functions
+
+### ✅ Configuration Integration
+- ✅ Configuration file loads and applies policies correctly
+- ✅ Security thresholds enforced as per CONTEXT.md decisions
+- ✅ Trusted patterns reduce false positives
+- ✅ Custom policies override defaults appropriately
+
+### ✅ Tool Integration
+- ✅ Bandit integration via subprocess with JSON output parsing
+- ✅ Semgrep integration with Python security rules
+- ✅ Fallback behavior when tools are unavailable
+- ✅ Timeout handling and error recovery
+
+---
+
+## Performance Metrics
+
+- **Analysis Speed:** <2 seconds for typical code samples
+- **Memory Usage:** Minimal temporary file footprint
+- **Error Handling:** Graceful degradation when security tools unavailable
+- **Scalability:** Handles code up to 50KB (configurable limit)
+
+---
+
+## Security Assessment Results
+
+The SecurityAssessor successfully categorizes code into four distinct levels:
+
+| Level | Score Range | Description | User Action |
+|-------|-------------|-------------|-------------|
+| **LOW** | 0-3 | Safe code with minimal concerns | Allow execution |
+| **MEDIUM** | 4-6 | Some security patterns found | Review before execution |
+| **HIGH** | 7-9 | Privileged access attempts | Require explicit override |
+| **BLOCKED** | 10+ | Malicious patterns or threats | Prevent execution |
+
+---
+
+## Files Modified/Created
+
+### New Files:
+- `src/security/__init__.py` - Security module exports
+- `src/security/assessor.py` - SecurityAssessor class (295 lines)
+- `config/security.yaml` - Security policies and thresholds (119 lines)
+
+### Modified Files:
+- `requirements.txt` - Added bandit>=1.7.7, semgrep>=1.99
+
+---
+
+## Compliance with Requirements
+
+✅ **Truths Maintained:**
+- Security assessment runs before any code execution
+- Code categorized as LOW/MEDIUM/HIGH/BLOCKED  
+- Assessment is fast and doesn't block user workflow
+
+✅ **Artifacts Delivered:**
+- `src/security/assessor.py` - Security assessment engine (295+ lines)
+- `requirements.txt` - Security analysis dependencies added
+- `config/security.yaml` - Security assessment policies with all levels
+
+✅ **Key Links Implemented:**
+- Bandit CLI integration via subprocess with `-f json` pattern
+- Semgrep CLI integration via subprocess with `--config` pattern
+
+---
+
+## Next Steps
+
+The security assessment infrastructure is now ready for integration with:
+1. Sandbox execution environment (Phase 02-02)
+2. Audit logging system (Phase 02-03)  
+3. Resource monitoring integration (Phase 02-04)
+
+The SecurityAssessor can be imported and used immediately:
+```python
+from src.security import SecurityAssessor, SecurityLevel
+
+assessor = SecurityAssessor()
+level, findings = assessor.assess(code_to_check)
+if level in [SecurityLevel.BLOCKED, SecurityLevel.HIGH]:
+    # Require user confirmation
+    pass
+```
+
+---
+
+## Commit History
+
+1. `feat(02-01): create security assessment module` - 93c26aa
+2. `feat(02-01): add security dependencies and configuration` - e407c32
+
+**Phase 02-01 successfully completed and ready for integration.**