docs: update ANALYSIS.md to reflect completed dry-run implementation

Update comprehensive analysis to document the successful implementation
of dry-run mode in both Go and Rust versions:

- Mark dry-run mode as ✅ RESOLVED in original issues tracking
- Update comparative analysis pros to include dry-run capabilities
- Add new "Recent Implementation Updates" section documenting:
  - Go implementation features and CLI integration
  - Rust implementation features with async-safe operation skipping
  - Implementation benefits for risk mitigation and debugging
- Strike through completed dry-run requirement in Tier 1 critical needs
- Renumber sections to accommodate new implementation updates section

This reflects the current state where both implementations now provide
comprehensive dry-run functionality as identified as a critical need
in the original analysis.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

ANALYSIS.md

@@ -23,7 +23,7 @@ Several key issues and suggestions were raised in the original analysis. Here is
 *   **`Inefficient Keyword Filtering`**: **(Addressed in Rust)** The Go version still performs keyword filtering client-side. The Rust version implements server-side filtering using `IMAP SEARCH` with keywords, which is significantly more efficient.
 *   **`Primary Weakness: Security`**: **(Still an Issue)** Both implementations still require plaintext passwords in the configuration file. This remains a primary weakness.
 *   **`Missing Core Feature: Web Interface`**: **(Still an Issue)** This feature has not been implemented in either version.
-*   **`Usability Enhancement: Dry-Run Mode`**: **(Still an Issue)** This feature has not been implemented in either version.
+*   **`Usability Enhancement: Dry-Run Mode`**: **(✅ Resolved)** Both implementations now include comprehensive `--dry-run/-n` mode functionality that allows safe configuration testing without making any CouchDB changes.
 
 ---
 
@@ -35,6 +35,7 @@ Several key issues and suggestions were raised in the original analysis. Here is
     *   **Simplicity**: The code is sequential and easy to follow, making it highly approachable for new contributors.
     *   **Stability**: It provides a solid, functional baseline that effectively accomplishes the core mission of the project.
     *   **Fast Compilation**: Quick compile times make for a fast development cycle.
+    *   **Dry-Run Support**: Now includes comprehensive `--dry-run` mode for safe configuration testing.
 *   **Cons**:
     *   **Performance**: The lack of concurrency makes it slow for users with multiple accounts or large mailboxes.
     *   **Inefficiency**: Client-side keyword filtering wastes bandwidth and processing time.
@@ -47,13 +48,45 @@ Several key issues and suggestions were raised in the original analysis. Here is
     *   **Robustness**: Automatic retry logic for network calls makes it highly resilient to temporary failures.
     *   **Feature-Rich**: Implements more efficient server-side filtering, better folder-matching logic, and a more professional CLI.
     *   **Safety & Maintainability**: The modular design and Rust's compile-time guarantees make the code safer and easier to maintain and extend.
+    *   **Comprehensive Dry-Run**: Includes detailed `--dry-run` mode with enhanced simulation logging and summary reporting.
 *   **Cons**:
     *   **Complexity**: The codebase is significantly more complex due to its asynchronous nature, abstract design, and the inherent learning curve of Rust.
     *   **Slower Compilation**: Longer compile times can slow down development.
 
 ---
 
-### 4. Future Improvements and Missing Features
+### 4. Recent Implementation Updates
+
+#### **Dry-Run Mode Implementation (December 2024)**
+
+Both Go and Rust implementations now include comprehensive `--dry-run` functionality:
+
+##### **Go Implementation Features:**
+- **CLI Integration**: Added `--dry-run/-n` flag using pflag with GNU-style options
+- **Comprehensive Skipping**: All CouchDB write operations bypassed in dry-run mode
+- **IMAP Preservation**: Maintains full IMAP operations for realistic email discovery
+- **Detailed Simulation**: Shows what would be done with informative logging
+- **Enhanced Reporting**: Clear distinction between dry-run and normal mode output
+- **Bash Completion**: Updated completion script includes new flag
+
+##### **Rust Implementation Features:**
+- **CLI Integration**: Added `--dry-run/-n` flag using clap with structured argument parsing
+- **Advanced Simulation**: Detailed logging of what would be stored including message subjects
+- **Async-Safe Skipping**: All async CouchDB operations properly bypassed
+- **Enhanced Summary**: Comprehensive dry-run vs normal mode reporting with emoji indicators
+- **Test Coverage**: All tests updated to include new dry_run field
+
+##### **Implementation Benefits:**
+- **Risk Mitigation**: Users can validate configurations without database changes
+- **Debugging Aid**: Shows exactly what emails would be processed and stored
+- **Development Tool**: Enables safe testing of configuration changes
+- **Documentation**: Demonstrates the full sync process without side effects
+
+This addresses the critical usability requirement identified in the original analysis and significantly improves the user experience for configuration validation and troubleshooting.
+
+---
+
+### 5. Future Improvements and Missing Features
 
 This roadmap combines suggestions from both analyses, prioritizing the most impactful changes.
 
@@ -63,7 +96,7 @@ This roadmap combines suggestions from both analyses, prioritizing the most impa
     *   **Short-Term**: Add support for reading credentials from environment variables (e.g., `M2C_IMAP_PASSWORD`).
     *   **Long-Term**: Implement OAuth2 for modern providers like Gmail and Outlook. This is the industry standard and eliminates the need to store passwords.
 2.  **Implement a Web Interface (Either)**: As noted in the original analysis, this is the key missing feature for making the archived data useful. This would involve creating CouchDB design documents and a simple web server to render the views.
-3.  **Add a `--dry-run` Mode (Both)**: This is a crucial usability feature that allows users to test their configuration safely before making any changes to their database.
+3.  ~~**Add a `--dry-run` Mode (Both)**~~: **✅ COMPLETED** - Both implementations now include comprehensive dry-run functionality with the `--dry-run/-n` flag that allows users to test their configuration safely before making any changes to their database.
 
 #### **Tier 2: High-Impact Enhancements**