docs: Update documentation for auto-update system and integration tests

DEVELOPMENT_PLAN.md

@@ -928,6 +928,11 @@ Help Menu
 - [x] Structured logging (JSON format option) - JSONFormatter class supports JSON output
 - [x] Log rotation/archival - _archive_old_logs() manages old logs with 30-day retention
 - [x] Performance metrics collection - PerformanceTracker context manager for timing operations
+  ```python
+  with PerformanceTracker("database_query") as tracker:
+      # Your code
+      pass  # Automatically logs elapsed time
+  ```
 - [x] Tests for enhanced logging - 20 tests covering all features
 
 **Features Implemented:**
@@ -1205,28 +1210,15 @@ February 2026
 
 ---
 
+## Current Phase
+
+Pre-release development (Phase 1-2). Integration tests for update flow implemented.
+
 ## Next Steps
 
-1. **Immediate** (This week):
-   - [ ] Set up project directories ✅
-   - [ ] Create configuration system
-   - [ ] Implement path validator
-   - [ ] Set up CI/CD
-
-2. **Near term** (Next 2 weeks):
-   - [ ] Complete core components
-   - [ ] Write comprehensive tests
-   - [ ] Build installers
-
-3. **Medium term** (Weeks 5-8):
-   - [ ] Code review & QA
-   - [ ] Performance optimization
-   - [ ] Documentation
-
-4. **Long term** (Months 2-3):
-   - [ ] Advanced features
-   - [ ] Community engagement
-   - [ ] Auto-update system
+- Finalize auto-update system
+- Expand integration test coverage (see `tests/integration/test_update_flow.py`)
+- Update documentation for new features
 
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