feat: Add bash completion for backup scripts and enhance README documentation

README.md

@@ -6,6 +6,7 @@ This repository contains various shell scripts for managing media-related tasks
 
 - **[Backup Scripts](#backup-scripts)** - Enterprise-grade backup solutions
 - **[Management Scripts](#management-scripts)** - System and service management
+- **[Tab Completion](#tab-completion)** - Intelligent command-line completion
 - **[Documentation](#documentation)** - Complete guides and references
 - **[Testing](#testing)** - Docker-based validation framework
 - **[Dotfiles](#dotfiles)** - System configuration files
@@ -201,6 +202,51 @@ curl -fsSL https://raw.githubusercontent.com/acedanger/shell/main/bootstrap.sh |
 
 For more information about the dotfiles, see [Dotfiles README](./dotfiles/README.md).
 
+## Tab Completion
+
+This repository includes intelligent bash completion for all backup scripts, providing tab completion for command-line flags and options.
+
+### Features
+
+- **Intelligent flag completion**: Tab completion for all backup script options
+- **Webhook URL suggestions**: Auto-complete common webhook endpoints
+- **Path-aware completion**: Works with relative, absolute, and PATH-based script execution
+- **Cross-shell support**: Compatible with both bash and zsh
+
+### Supported Scripts
+
+- **backup-immich.sh**: `--help`, `--dry-run`, `--no-upload`, `--verbose`
+- **backup-plex.sh**: `--help`, `--auto-repair`, `--check-integrity`, `--non-interactive`, `--no-parallel`, `--no-performance`, `--webhook`, `--email`
+- **backup-media.sh**: `--help`, `--dry-run`, `--no-verify`, `--sequential`, `--interactive`, `--webhook`
+- **Generic backup scripts**: Common flags for all backup utilities
+
+### Usage Examples
+
+```bash
+# Tab completion for backup script flags
+~/shell/immich/backup-immich.sh --<TAB>
+# Shows: --help --dry-run --no-upload --verbose
+
+# Tab completion for webhook URLs
+~/shell/plex/backup-plex.sh --webhook <TAB>
+# Shows: https://notify.peterwood.rocks/lab
+
+# Works with any script path
+backup-immich.sh --<TAB>          # From PATH
+./backup-immich.sh --<TAB>        # Relative path
+/full/path/backup-immich.sh --<TAB>  # Absolute path
+```
+
+### Installation
+
+Tab completion is automatically installed when you run the setup scripts:
+
+```bash
+./setup/bootstrap.sh  # Installs completion automatically
+```
+
+For manual installation or more details, see [Completions README](./completions/README.md).
+
 ## Testing
 
 This repository includes Docker-based testing to validate the setup process across different environments. For complete testing documentation, see [Docker Bootstrap Testing Framework](./docs/docker-bootstrap-testing-framework.md).
@@ -242,6 +288,7 @@ For complete crontab management documentation, see [Crontab Management Documenta
 ### Current Status
 
 The crontab system uses hostname-specific configuration files:
+
 - **crontab-europa.txt** - Media server configuration
 - **crontab-io.txt** - Download/acquisition server configuration
 - **crontab-racknerd.txt** - Backup server configuration