This PR adds a new defaultRepository setting to the global configuration file (~/.azbootstrap-globals.jsonc) that provides a default template repository when running in interactive mode.

Changes Made

Core Functionality

• Modified Start-AzBootstrapInteractiveMode.ps1: Added logic to load the global config and use defaultRepository as the default when prompting for template repository URL
• Safety: Only applies in interactive mode - never used in non-interactive/automated scenarios to prevent unintended consequences

Configuration & Documentation

• Updated .azbootstrap-globals.jsonc.example: Added defaultRepository setting example
• Enhanced README.md: Added comprehensive documentation explaining the new setting and its behavior

Testing

• Extended Test-Interactive.Tests.ps1: Added focused tests covering both scenarios (config present/absent)
• All tests pass: 31 tests passing, confirming no regression

Usage Example

{
    "templateAliases": {
        "terraform": "https://github.com/kewalaka/terraform-azure-starter-template",
        "bicep": "https://github.com/kewalaka/bicep-azure-starter-template"
    },
    "defaultLocation": "eastus",
    "defaultRepository": "terraform"  // Can be alias, shorthand, or full URL
}

When running interactively without specifying a template repository:

Enter Template Repository URL [terraform]: <press Enter>
# Uses the terraform alias from your config instead of the hardcoded default

Key Features

• Flexible values: Accepts template aliases, GitHub shorthand (owner/repo), or full URLs
• Interactive mode only: Preserves safety in automated scenarios as requested
• Backwards compatible: Falls back to existing hardcoded default when no setting is present
• Follows existing patterns: Uses the same global config system as defaultLocation

Fixes #49.

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