🧙 Improve add wizard with merge prompt and dirty check

[dsyme]

Summary

• Adds an interactive confirmation prompt when a PR merge fails, allowing users to continue manually or stop gracefully
• Validates that the working directory is clean early in the wizard flow, before PR creation, with helpful recovery instructions
• Surfaces clear error messages and guidance for both failure scenarios

[Copilot]

Pull request overview

This PR enhances the interactive add wizard with better user experience improvements for two failure scenarios: PR merge failures and dirty working directories.

Changes:

• Adds early validation for clean working directory before PR creation to fail fast with clear guidance
• Implements an interactive confirmation prompt when PR merge fails, allowing users to manually merge and continue or stop gracefully
• Provides helpful error messages with recovery instructions for both scenarios

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/cli/add_interactive_orchestrator.go	Adds early clean working directory check at Step 3b, before workflow file operations
pkg/cli/add_interactive_git.go	Implements merge failure prompt with continue/stop options and checkCleanWorkingDirectory method with user-friendly error guidance

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