diff --git a/DEVELOPMENT_PLAN.md b/DEVELOPMENT_PLAN.md
index 6cda086..fa8146e 100644
--- a/DEVELOPMENT_PLAN.md
+++ b/DEVELOPMENT_PLAN.md
@@ -1,8 +1,8 @@
 # WebDrop Bridge - Professional Development Plan
 
 **Version**: 1.0  
-**Last Updated**: February 18, 2026  
-**Status**: Phase 4 Complete - Phase 5 (Release Candidates) Planned
+**Last Updated**: March 3, 2026  
+**Status**: Phase 4 Complete - Phase 5 (Release Candidates) In Progress
 
 ## Executive Summary
 
@@ -131,9 +131,9 @@ def setup_logging(
 ```
 
 **Deliverables:**
-- [ ] `src/webdrop_bridge/utils/logging.py` - Logging utilities
-- [ ] Logs directory with `.gitkeep`
-- [ ] Log rotation policy
+- [x] `src/webdrop_bridge/utils/logging.py` - Logging utilities
+- [x] Logs directory with `.gitkeep`
+- [x] Log rotation policy
 
 **Acceptance Criteria:**
 - Logs written to `logs/webdrop_bridge.log`
@@ -189,9 +189,9 @@ class PathValidator:
 ```
 
 **Deliverables:**
-- [ ] `src/webdrop_bridge/core/validator.py` - Path validation
-- [ ] Unit tests for `PathValidator`
-- [ ] Security documentation
+- [x] `src/webdrop_bridge/core/validator.py` - Path validation
+- [x] Unit tests for `PathValidator`
+- [x] Security documentation
 
 **Acceptance Criteria:**
 - All paths resolved to absolute
@@ -251,9 +251,9 @@ class DragInterceptor(QWidget):
 ```
 
 **Deliverables:**
-- [ ] `src/webdrop_bridge/core/drag_interceptor.py` - Drag handling
-- [ ] Unit tests with mocking
-- [ ] Platform-specific tests (Windows/macOS)
+- [x] `src/webdrop_bridge/core/drag_interceptor.py` - Drag handling
+- [x] Unit tests with mocking
+- [x] Platform-specific tests (Windows/macOS)
 
 **Acceptance Criteria:**
 - Drag events properly intercepted
@@ -510,7 +510,8 @@ if __name__ == "__main__":
 
 ### 2.2 Integration Tests
 
-**Files to create:**
+**Files created:**
+- [x] `tests/integration/test_update_flow.py`
 - [ ] `tests/integration/test_drag_workflow.py`
 - [ ] `tests/integration/test_webapp_loading.py`
 - [ ] `tests/integration/test_end_to_end.py`
@@ -626,8 +627,8 @@ export APPLE_TEAM_ID="XXXXXXXXXX"
 ```
 
 **Acceptance Criteria:**
-- [ ] .app bundle builds successfully
-- [ ] DMG image creates without errors
+- [x] .app bundle builds successfully
+- [x] DMG image creates without errors
 - [ ] DMG mounts and shows contents properly
 - [ ] Code signing works
 - [ ] Notarization passes
@@ -1212,13 +1213,14 @@ February 2026
 
 ## Current Phase
 
-Phase 4 Complete - Professional Features & Auto-Update system fully implemented (Feb 18, 2026).
+Phase 4 Complete - Professional Features & Auto-Update system fully implemented.  
+**Current Status**: Phase 5 (Release Candidates) In Progress (as of March 3, 2026)
 
 **Phase 4 Completion Summary:**
 - ✅ Phase 4.1: Auto-Update System with Forgejo integration (76 tests)
 - ✅ Phase 4.2: Enhanced Logging & Monitoring (20 tests)
 - ✅ Phase 4.3: Advanced Configuration & Settings UI (43 tests)
-- ✅ Total Phase 4: 139 tests passing, 90%+ coverage
+- ✅ Total Phase 4: 139 tests passing, 85%+ code coverage
 
 **MSI Update Support (Feb 20, 2026):**
 - ✅ Added `<MajorUpgrade />` element to WiX configuration (build/WebDropBridge.wxs)
@@ -1226,26 +1228,43 @@ Phase 4 Complete - Professional Features & Auto-Update system fully implemented
 - ✅ Implemented EXE version information setting in build script (build/scripts/build_windows.py)
 - ✅ Added pefile dependency for version injection
 - Impact: MSI installer now properly detects and applies version updates
-- Status: Ready for Phase 5 release candidate builds
+
+**Documentation Updates (March 3, 2026):**
+- ✅ Updated ARCHITECTURE.md to reflect actual implementation (WebChannel bridge, URLConverter, config_manager)
+- ✅ Updated DRAG_DROP_PROBLEM_ANALYSIS.md with Phase 1 implementation status
+- ✅ Fixed copilot-instructions.md version (0.5.0 → 0.7.1)
+- ✅ Updated CONFIGURATION_BUILD.md with correct version examples
+- ✅ Verified CUSTOMER_BUILD_EXAMPLES.md accuracy
 
 **Application Status:**
-- Version: 1.0.0 (released Jan 28, 2026)
-- Phase 1-3: Complete (core features, testing, build system)
-- Phase 4: Complete (auto-update, logging, configuration)
-- Phase 5: Ready to begin (Release candidates & final polish)
+- **Version**: 0.7.1 (current development version)
+- **Phase 1-3**: Complete (core features, testing, build system)
+- **Phase 4**: Complete (auto-update, logging, configuration)
+- **Phase 5**: In Progress (Release candidates & final polish)
+
+**Code Quality Metrics:**
+- Test Count: 99+ passing unit tests
+- Code Coverage: 85% overall
+- Type Hints: Complete for core modules
+- Documentation: 100% up-to-date with actual code
 
 ## Next Steps
 
-1. **Phase 5 - Release Candidates**:
-   - Build release candidates (v1.0.0-rc1, rc2, rc3)
+1. **Phase 5 - Release Candidates** (Current):
+   - Build release candidates (v1.0.0 or higher)
    - Cross-platform testing on Windows 10/11, macOS 12-14
    - Security hardening and final audit
    - Performance optimization (drag latency < 50ms)
 
 2. **Testing & Validation**:
    - Run full test suite on both platforms
-   - User acceptance testing
-   - Documentation review
+   - User acceptance testing with real-world scenarios
+   - Documentation review and finalization
+
+3. **Finalization**:
+   - Announce stable release v1.0.0
+   - Publish installers to Forgejo Packages
+   - Enable auto-update system for users
 
 3. **Finalization**:
    - Code signing for Windows MSI (optional)