docs: reorganize and update all documentation to reflect production readiness

- Move all documentation to docs/ directory for better organization
- Update ANALYSIS.md with current production status and resolved issues
- Completely rewrite IMPLEMENTATION_COMPARISON.md with feature parity matrix
- Update TODO.md to reflect completed milestones and future roadmap
- Create comprehensive docs/README.md as documentation index
- Update main README.md with project status and documentation links
- All documentation now reflects August 2025 production-ready status
- Both implementations verified as feature-complete with identical output

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

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

docs/test-config-comparison.md

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+# Test Configuration Comparison: Rust vs Go
+
+## Overview
+
+Two identical test configurations have been created for testing both Rust and Go implementations with the test environment:
+
+- **Rust**: `/home/olemd/src/mail2couch/rust/config-test-rust.json`
+- **Go**: `/home/olemd/src/mail2couch/go/config-test-go.json`
+
+## Configuration Details
+
+Both configurations use the **same test environment** from `/home/olemd/src/mail2couch/test/` with:
+
+### Database Connection
+- **CouchDB URL**: `http://localhost:5984`
+- **Admin Credentials**: `admin` / `password`
+
+### IMAP Test Server
+- **Host**: `localhost`
+- **Port**: `3143` (GreenMail test server)
+- **Connection**: Plain (no TLS for testing)
+
+### Test Accounts
+
+Both configurations use the **same IMAP test accounts**:
+
+| Username | Password | Purpose |
+|----------|----------|---------|
+| `testuser1` | `password123` | Wildcard all folders test |
+| `syncuser` | `syncpass` | Work pattern test (sync mode) |
+| `archiveuser` | `archivepass` | Specific folders test |
+| `testuser2` | `password456` | Subfolder pattern test (disabled) |
+
+### Mail Sources Configuration
+
+Both configurations define **identical mail sources** with only the account names differing:
+
+#### 1. Wildcard All Folders Test
+- **Account Name**: "**Rust** Wildcard All Folders Test" vs "**Go** Wildcard All Folders Test"
+- **Mode**: `archive`
+- **Folders**: All folders (`*`) except `Drafts` and `Trash`
+- **Filters**: Subject keywords: `["meeting", "important"]`, Sender keywords: `["@company.com"]`
+
+#### 2. Work Pattern Test
+- **Account Name**: "**Rust** Work Pattern Test" vs "**Go** Work Pattern Test"
+- **Mode**: `sync` (delete removed emails)
+- **Folders**: `Work*`, `Important*`, `INBOX` (exclude `*Temp*`)
+- **Filters**: Recipient keywords: `["support@", "team@"]`
+
+#### 3. Specific Folders Only
+- **Account Name**: "**Rust** Specific Folders Only" vs "**Go** Specific Folders Only"
+- **Mode**: `archive`
+- **Folders**: Exactly `INBOX`, `Sent`, `Personal`
+- **Filters**: None
+
+#### 4. Subfolder Pattern Test (Disabled)
+- **Account Name**: "**Rust** Subfolder Pattern Test" vs "**Go** Subfolder Pattern Test"
+- **Mode**: `archive`
+- **Folders**: `Work/*`, `Archive/*` (exclude `*/Drafts`)
+- **Status**: `enabled: false`
+
+## Expected Database Names
+
+When run, each implementation will create **different databases** due to the account name differences:
+
+### Rust Implementation Databases
+- `m2c_rust_wildcard_all_folders_test`
+- `m2c_rust_work_pattern_test`
+- `m2c_rust_specific_folders_only`
+- `m2c_rust_subfolder_pattern_test` (disabled)
+
+### Go Implementation Databases
+- `m2c_go_wildcard_all_folders_test`
+- `m2c_go_work_pattern_test`
+- `m2c_go_specific_folders_only`
+- `m2c_go_subfolder_pattern_test` (disabled)
+
+## Testing Commands
+
+### Start Test Environment
+```bash
+cd /home/olemd/src/mail2couch/test
+./start-test-env.sh
+```
+
+### Run Rust Implementation
+```bash
+cd /home/olemd/src/mail2couch/rust
+cargo build --release
+./target/release/mail2couch -c config-test-rust.json
+```
+
+### Run Go Implementation
+```bash
+cd /home/olemd/src/mail2couch/go
+go build -o mail2couch .
+./mail2couch -c config-test-go.json
+```
+
+### Verify Results
+```bash
+# List all databases
+curl http://localhost:5984/_all_dbs
+
+# Check Rust databases
+curl http://localhost:5984/m2c_rust_wildcard_all_folders_test
+curl http://localhost:5984/m2c_rust_work_pattern_test
+curl http://localhost:5984/m2c_rust_specific_folders_only
+
+# Check Go databases  
+curl http://localhost:5984/m2c_go_wildcard_all_folders_test
+curl http://localhost:5984/m2c_go_work_pattern_test
+curl http://localhost:5984/m2c_go_specific_folders_only
+```
+
+### Stop Test Environment
+```bash
+cd /home/olemd/src/mail2couch/test
+./stop-test-env.sh
+```
+
+## Validation Points
+
+Both implementations should produce **identical results** when processing the same IMAP accounts:
+
+1. **Database Structure**: Same document schemas and field names
+2. **Message Processing**: Same email parsing and storage logic
+3. **Folder Filtering**: Same wildcard pattern matching
+4. **Message Filtering**: Same keyword filtering behavior
+5. **Sync Behavior**: Same incremental sync and deletion handling
+6. **Error Handling**: Same retry logic and error recovery
+
+The only differences should be:
+- Database names (due to account name prefixes)
+- Timestamp precision (implementation-specific)
+- Internal document IDs format (if any)
+
+## Use Cases
+
+### Feature Parity Testing
+Run both implementations with the same configuration to verify identical behavior:
+```bash
+# Run both implementations
+./test-both-implementations.sh
+
+# Compare database contents
+./compare-database-results.sh
+```
+
+### Performance Comparison
+Use identical configurations to benchmark performance differences between Rust and Go implementations.
+
+### Development Testing
+Use separate configurations during development to avoid database conflicts when testing both implementations simultaneously.