docs: Add notification compression documentation

- Update README with feature description
- Add configuration section for notification compression
- Create demo script showcasing the feature
- Document all supported platforms (GitLab, GitHub, Jira, etc.)
- Provide usage examples and configuration options

README.md

@@ -12,6 +12,7 @@ A CLI tool for syncing Microsoft Outlook email, calendar, and tasks to local fil
 - **TUI Dashboard**: Interactive terminal dashboard for monitoring sync progress
 - **Daemon Mode**: Background daemon with proper Unix logging
 - **Cross-Platform**: Works on macOS, Linux, and Windows
+- **Smart Notification Compression**: Automatically detects and compresses transactional notification emails (GitLab, GitHub, Jira, Confluence, Datadog, Renovate) into terminal-friendly summaries
 
 ## Quick Start
 
@@ -50,6 +51,37 @@ mkdir -p ~/.local/share/luk
 
 Create a configuration file at `~/.config/luk/config.env`:
 
+### Notification Email Compression
+
+LUK includes intelligent notification email compression to reduce visual noise from automated emails (GitLab, GitHub, Jira, Confluence, Datadog, Renovate). Configure it in `~/.config/luk/mail.toml`:
+
+```toml
+[content_display]
+# Enable/disable notification compression
+compress_notifications = true
+
+# Compression mode:
+# - "summary": Brief one-page view (default)
+# - "detailed": More details in structured format
+# - "off": Disable compression, show full emails
+notification_compression_mode = "summary"
+```
+
+**Features:**
+- **Automatic detection**: Identifies notification emails by sender domain and subject patterns
+- **Type-specific summaries**: Extracts relevant info per platform (pipeline IDs, PR numbers, etc.)
+- **Terminal-friendly formatting**: Clean markdown with icons and clear hierarchy
+- **Toggle support**: Press `m` in mail view to switch between compressed and full email
+
+**Demo:**
+```bash
+python demo_notification_compression.py
+```
+
+See `mail.toml.example` for full configuration options.
+
+### General Configuration
+
 ```bash
 # Microsoft Graph settings
 MICROSOFT_CLIENT_ID=your_client_id